Updated · July 2026
How close are we to room-temperature superconductors?Can electricity flow with no resistance at room temperature?
Can electricity flow with no resistance at room temperature?How close are we to room-temperature superconductors?
Superconductivity near room temperature has only been credibly observed under megabar pressures; every ambient-pressure room-temperature claim has failed replication or been retracted.Materials squeezed to crushing pressures lose resistance when nearly warm, but nothing verified works in an ordinary room - and the loudest recent claims turned out to be wrong.
Recorded milestones
Superconductivity discovered
Ambient record inches to 151 K
Open tests · conceptual branches
- OPEN TEST01 ↗Beat the freezing point of water, even inside a viseSuperconductivity above 0°C at any pressureSqueezed hydrogen-rich materials get close - the verified record is about −23°C at 1.7 million atmospheres.Independently replicated zero resistance above 273 K, extreme pressure allowed
- OPEN TEST02 ↗Prove it works in a normal roomAmbient-pressure room-temperature demonstrationThe verified everyday-pressure record is −122°C - a big 2026 jump after 33 stuck years, but far from room temperature.Zero resistance and Meissner effect near 293 K at 1 atm, replicated by independent labs
- OPEN TEST03 ↗Turn it into affordable wireManufacturable room-temperature conductorNo such material exists to manufacture; today's superconducting tape industry still runs on liquid-nitrogen-cooled cuprates.High critical current and field in kilometer-scale wire or tape at competitive cost
The path shows Ambient record inches to 151 K. Open thresholds are separate tests in a conceptual map, not a forecast. No single percentage represents progress.
Where we standWhere we stand
The current stage, the evidence recorded, and the single threshold that gates the next stage.The stage reached, the evidence recorded, and the one test still blocking the next step.
What the evidence has shownWhat the evidence has shown
Materials squeezed to crushing pressures lose resistance when nearly warm, but nothing verified works in an ordinary room - and the loudest recent claims turned out to be wrong.Superconductivity near room temperature has only been credibly observed under megabar pressures; every ambient-pressure room-temperature claim has failed replication or been retracted.
The next testBlocking threshold
Beat the freezing point of water, even inside a viseSuperconductivity above 0°C at any pressureIndependent diamond-anvil replication of any superhydride claim above 273 KIndependent diamond-anvil replication of any superhydride claim above 273 K
What would count as proof?What would count as proof?
A clear test, the evidence behind it, and the limits of the claim.A clear test, the evidence behind it, and what it still leaves open.
Beat the freezing point of water, even inside a viseSuperconductivity above 0°C at any pressure
Squeezed hydrogen-rich materials get close - the verified record is about −23°C at 1.7 million atmospheres.Independently replicated zero resistance above 273 K, extreme pressure allowed
Next test Independent diamond-anvil replication of any superhydride claim above 273 K
Still to demonstrateWhat this does not establishA separate system can still have different conditions and results.The named measurement has no wider implication until the supporting system test is also shown.
View every evidence record
Open test
Beat the freezing point of water, even inside a viseSuperconductivity above 0°C at any pressure
Squeezed hydrogen-rich materials get close - the verified record is about −23°C at 1.7 million atmospheres.Independently replicated zero resistance above 273 K, extreme pressure allowed
Next test: Independent diamond-anvil replication of any superhydride claim above 273 K
Open test
Prove it works in a normal roomAmbient-pressure room-temperature demonstration
The verified everyday-pressure record is −122°C - a big 2026 jump after 33 stuck years, but far from room temperature.Zero resistance and Meissner effect near 293 K at 1 atm, replicated by independent labs
Next test: Independent replication of pressure-quenched Hg-1223 at 151 K (Houston, 2026)
Open test
Turn it into affordable wireManufacturable room-temperature conductor
No such material exists to manufacture; today's superconducting tape industry still runs on liquid-nitrogen-cooled cuprates.High critical current and field in kilometer-scale wire or tape at competitive cost
Next test: Awaits a verified ambient material; REBCO tape scale-up for fusion magnets is the nearest proxy
The record behind the verdictThe record behind the verdict
Major milestones and smaller context events share one source-linked record. Scheduled targets are marked separately from recorded events.Milestones, smaller events and setbacks share one sourced record. Scheduled targets are marked separately from recorded events.
Event key
The low-temperature era
This record spans “Superconductivity discovered” to “Nb3Sn enables practical high-field magnets”.
The cuprate high-Tc revolution
This record spans “Cuprate revolution begins” to “Mercury cuprate sets 133 K ambient record”.
The high-pressure hydride era
This record spans “Hydrogen sulfide superconducts at 203 K - under extreme pressure” to “CSH 288 K 'room-temperature' claim (later retracted)”.
The ambient-pressure push
This record spans “Nickelate shows signatures near 80 K” to “Target: an independently replicated ambient room-temp material” and includes scheduled targets.
Additional records
This record spans “Nature retracts the CSH room-temperature paper” to “Target: a manufacturable room-temperature conductor” and includes scheduled targets.
The data behind the verdictThe data behind the verdict
Read each measure with its units, conditions, uncertainty and source; targets remain distinct from observations.Read each chart with its conditions, limits and source. Future targets remain distinct from recorded results.
- 1La-Ba-Cu-O cuprate, ~35 K - AMBIENT pressure (Bednorz & Müller) · 35 K · 1986 · ambient-pressure record
- 2YBCO, 93 K - AMBIENT pressure, first above liquid-nitrogen boiling point · 93 K · 1987 · ambient-pressure record
- 3HgBa2Ca2Cu3O8+δ cuprate, 133 K - AMBIENT-pressure record · 133 K · 1993 · ambient-pressure record
- 4H3S (sulfur hydride), 203 K - HIGH PRESSURE, requires ~155 GPa · 203 K · 2015 · high-pressure record; approximately 155–190 GPa
- 5LaH10 (lanthanum hydride), ~260 K - HIGH PRESSURE, ~188 GPa · 260 K · 2019 · high-pressure record; approximately 155–190 GPa
- A77 K - liquid-nitrogen boiling point (cheap cooling); crossed by YBCO in 1987 · 77 K77 K - liquid-nitrogen boiling point (cheap cooling); crossed by YBCO in 1987 · 77 K
- B273 K (0 °C) benchmark at ambient pressure · 273 K273 K (0 °C) benchmark at ambient pressure · 273 K
Records are separate measurements; no line joins them. The two highest points (H3S, LaH10) require ~155-190 GPa - over a million atmospheres. The established ambient-pressure record remains 133 K; a 2026 pressure-quenched Hg-1223 report reached about 151 K after pressure removal but is not yet independently replicated. The retracted 2020 room-temperature claim is excluded.
Methods & conditions
Under the measurement.
The boundary of a measurement changes what it means.
The first nickelate evidence was filamentary
Method and conditions
The original La₃Ni₂O₇ result was explicitly reported as “signatures”: resistance and mutual-inductance susceptibility supported superconductivity, but later work found low or filamentary superconducting fractions in imperfect samples. Pressure creates an Fmmm phase with strong Ni d(x²−y²) and d(z²)-O 2p mixing.
Source notes
Technical notes and sources
Each note keeps its authored method, conditions and citations available for review.
The first nickelate evidence was filamentary
The original La₃Ni₂O₇ result was explicitly reported as “signatures”: resistance and mutual-inductance susceptibility supported superconductivity, but later work found low or filamentary superconducting fractions in imperfect samples. Pressure creates an Fmmm phase with strong Ni d(x²−y²) and d(z²)-O 2p mixing.
Disorder separates bulk from filaments
In La₂PrNi₂O₇, the orthorhombic-to-tetragonal transition occurs near 11 GPa; reducing intergrowths and apical-oxygen disorder was central to obtaining bulk rather than filamentary superconductivity.
A 45 K onset is not zero resistance
The ambient nickelate-film result depends on roughly 2% coherent in-plane compressive epitaxial strain. Its 45 K onset is not a 45 K zero-resistance or Meissner temperature: those occur near 9 K and 8 K respectively.
Film defects complicate attribution
A separate La₃Ni₂O₇ film study found onsets of 26-42 K but zero resistance only around 2 K, with stacking faults, grain boundaries, oxygen stoichiometry and secondary Ruddlesden-Popper phases complicating attribution.
Onset, zero resistance and Meissner differ
The 96 K La₂SmNi₂O₇−δ figure is an onset under 26.8 GPa. The strongest combined bulk evidence was obtained under slightly different conditions: onset 92 K, zero resistance 73 K at 21.6 GPa, and Meissner response near 60 K at 20.6 GPa.
Hydride samples contain mixed phases
Spatial X-ray mapping of (La,Y)H₁₀ resolved coexisting cubic and hexagonal micron-scale domains-approximately 42% cubic and 58% hexagonal at 153 GPa-showing why phase identity, strain and pressure gradients complicate hydride critical-temperature assignments.
The 274 K anomaly is not a verified Tc
The La-Sc hydride paper’s reproducible superconducting-diode and SQUID-like effects occur at 233 K; its 274 K resistance anomaly was only tentatively attributed to a separate lower hydride phase and is not a verified critical temperature.
If the remaining tests pass.If the remaining tests pass.
Downstream capabilities remain conditional on results that are not yet in.These are possible next capabilities, conditional on results that are not yet in.
- OPEN TEST01 ↗Beat the freezing point of water, even inside a viseSuperconductivity above 0°C at any pressureSqueezed hydrogen-rich materials get close - the verified record is about −23°C at 1.7 million atmospheres.Independently replicated zero resistance above 273 K, extreme pressure allowed
- OPEN TEST02 ↗Prove it works in a normal roomAmbient-pressure room-temperature demonstrationThe verified everyday-pressure record is −122°C - a big 2026 jump after 33 stuck years, but far from room temperature.Zero resistance and Meissner effect near 293 K at 1 atm, replicated by independent labs
- OPEN TEST03 ↗Turn it into affordable wireManufacturable room-temperature conductorNo such material exists to manufacture; today's superconducting tape industry still runs on liquid-nitrogen-cooled cuprates.High critical current and field in kilometer-scale wire or tape at competitive cost
Possible, if the open tests pass.
Lossless power grids
This is a possible benefit only if lossless power grids works safely, reliably and at useful scale.Potential benefit only if the stated use (Lossless power grids) is demonstrated with evidence for safety, reliability, affordability and scale.
Cheap, compact fusion magnets
This is a possible benefit only if cheap, compact fusion magnets works safely, reliably and at useful scale.Potential benefit only if the stated use (Cheap, compact fusion magnets) is demonstrated with evidence for safety, reliability, affordability and scale.
Related problem ↗Everyday levitation and imaging
This is a possible benefit only if everyday levitation and imaging works safely, reliably and at useful scale.Potential benefit only if the stated use (Everyday levitation and imaging) is demonstrated with evidence for safety, reliability, affordability and scale.
Meet the builders.Meet the builders.
The organisations, their approaches, and the evidence behind them.The teams doing the work, the money around them, and what the record can support.
Germany · lab
Max Planck Institute for Chemistry high-pressure group
Established the hydrogen-rich high-pressure route, including H3S superconductivity above 200 K.
Capital is context, not a demonstration.
Company source ↗View every builder record
Max Planck Institute for Chemistry high-pressure group
Germany · lab · Established the hydrogen-rich high-pressure route, including H3S superconductivity above 200 K.
Funding: Funding not recorded in this record.
Group leader Mikhail Eremets died in 2024; the replicated hydride result remains foundational.
Company source ↗Hemley Research Group
USA · lab · Synthesizes and measures high-pressure hydrides and other candidate superconducting materials.
Funding: Funding not recorded in this record.
Company source ↗Institute of Physics, Chinese Academy of Sciences
China · lab · Explores quantum materials under high pressure, including bulk nickelate superconductivity.
Funding: Funding not recorded in this record.
Company source ↗International Center for Quantum Materials, Peking University
China · lab · Studies unconventional superconductivity and collaborates on strain-stabilized nickelate films.
Funding: Funding not recorded in this record.
Company source ↗High Temperature Superconductors, Inc.
USA · company · Develops coated-conductor tape using known cryogenic high-temperature superconductors.
Funding: Funding not recorded in this record.
This is manufacturing progress for cryogenic HTS, not a room-temperature material.
Company source ↗Follow the evidence.Follow the evidence.
39 sources — every figure on this page traces to one.39 sources — every figure on this page traces to one.
- 01
Drozdov et al., Nature 569 (2019) - LaH₁₀ at 250 K
Read source ↗nature.comUsed on this pageAll 5 uses across 4 destinations
Scope: Primary publication named by Drozdov et al., Nature 569 (2019) - LaH₁₀ at 250 K. Limit: The publication's measured scope does not establish downstream engineering or deployment claims.
- 02
Nature retraction note - N-doped lutetium hydride (2023)
Read source ↗nature.comScope: Primary publication named by Nature retraction note - N-doped lutetium hydride (2023). Limit: The publication's measured scope does not establish downstream engineering or deployment claims.
- 03
Phys.org (Nov 2023) - myth of room-temperature superconductivity in LK-99 is shattered
Read source ↗phys.orgUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 04
Ko et al., Nature 638 (2024) - ambient-pressure nickelate films
Read source ↗nature.comScope: Primary publication named by Ko et al., Nature 638 (2024) - ambient-pressure nickelate films. Limit: The publication's measured scope does not establish downstream engineering or deployment claims.
- 05
Phys.org (Mar 2026) - Hg-1223 quenched to 151 K at ambient pressure
Read source ↗phys.orgScope: Not recorded. Limit: Not recorded.
- 06
Scope: Not recorded. Limit: Not recorded.
- 07
Timeline · BCS theory explains superconductivity
Read source ↗en.wikipedia.orgUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 08
Timeline · Nb3Sn enables practical high-field magnets
Read source ↗en.wikipedia.orgUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 09
Timeline · Cuprate revolution begins
Read source ↗en.wikipedia.orgUsed on this pageAll 5 uses across 4 destinations
Scope: Not recorded. Limit: Not recorded.
- 10
Timeline · YBCO breaks the liquid-nitrogen barrier
Read source ↗en.wikipedia.orgUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 11
Timeline · Mercury cuprate sets 133 K ambient record
Read source ↗nature.comUsed on this pageAll 4 uses across 3 destinations
Scope: Not recorded. Limit: Not recorded.
- 12
Timeline · Hydrogen sulfide superconducts at 203 K - under extreme pressure
Read source ↗nature.comUsed on this pageAll 5 uses across 4 destinations
Scope: Not recorded. Limit: Not recorded.
- 13
Timeline · CSH 288 K 'room-temperature' claim (later retracted)
Read source ↗nature.comUsed on this pageScope: Not recorded. Limit: Not recorded.
- 14
Timeline · Nature retracts the CSH room-temperature paper
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 15
Timeline · Nickelate shows signatures near 80 K
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 16
Scope: Not recorded. Limit: Not recorded.
- 17
Timeline · Trilayer nickelate shows bulk response
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 18
Timeline · Bilayer nickelate goes bulk above 80 K
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 19
Timeline · Strained nickelate works at ambient pressure
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 20
Timeline · Nickelate onset reaches 96 K
Read source ↗nature.comUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 21
Timeline · Ambient record inches to 151 K via pressure quench
Read source ↗pnas.orgUsed on this pageAll 5 uses across 4 destinations
Scope: Not recorded. Limit: Not recorded.
- 22
Timeline · Target: an independently replicated ambient room-temp material
Read source ↗en.wikipedia.orgScope: Not recorded. Limit: Not recorded.
- 23
Metric · LaH10 (lanthanum hydride), ~260 K - HIGH PRESSURE, ~188 GPa
Read source ↗journals.aps.orgUsed on this pageScope: Not recorded. Limit: Not recorded.
- 24
Engineer note · Hydride samples contain mixed phases
Read source ↗nature.comScope: Not recorded. Limit: Not recorded.
- 25
Engineer note · The 274 K anomaly is not a verified Tc
Read source ↗advanced.onlinelibrary.wiley.comScope: Not recorded. Limit: Not recorded.
- 26
companies · Max Planck Institute for Chemistry high-pressure group
Read source ↗mpic.deUsed on this pageScope: Not recorded. Limit: Not recorded.
- 27
companies · Hemley Research Group
Read source ↗hemley.lab.uic.eduUsed on this pageAll 1 use across 1 destination
Scope: Not recorded. Limit: Not recorded.
- 28
companies · Institute of Physics, Chinese Academy of Sciences
Read source ↗english.iop.cas.cnUsed on this pageScope: Not recorded. Limit: Not recorded.
- 29
companies · International Center for Quantum Materials, Peking University
Read source ↗icqm.pku.edu.cnUsed on this pageScope: Not recorded. Limit: Not recorded.
- 30
companies · High Temperature Superconductors, Inc.
Read source ↗energy.govUsed on this pageAll 1 use across 1 destination
Scope: Not recorded. Limit: Not recorded.
- 31
Scope: Not recorded. Limit: Not recorded.
- 32
market · No validated room-temperature-superconductor market
Read source ↗energy.govUsed on this pageAll 1 use across 1 destination
Scope: Not recorded. Limit: Not recorded.
- 33
market · $300K cap for NSF exploratory awards
Read source ↗nsf.govUsed on this pageAll 2 uses across 2 destinations
Scope: Not recorded. Limit: Not recorded.
- 34
market · $5M ARPA-E coated-conductor project
Read source ↗arpa-e.energy.govUsed on this pageAll 1 use across 1 destination
Scope: Not recorded. Limit: Not recorded.
- 35
geography · International facilities
Read source ↗energy.govUsed on this pageAll 1 use across 1 destination
Scope: Not recorded. Limit: Not recorded.
- 36
Max Planck Institute for Chemistry high-pressure group official site
Read source ↗mpic.deScope: Not recorded. Limit: Not recorded.
- 37
Institute of Physics, Chinese Academy of Sciences official site
Read source ↗english.iop.cas.cnScope: Not recorded. Limit: Not recorded.
- 38
International Center for Quantum Materials, Peking University official site
Read source ↗icqm.pku.edu.cnScope: Not recorded. Limit: Not recorded.
- 39
High Temperature Superconductors, Inc. official site
Read source ↗hitsuperconductors.comScope: Not recorded. Limit: Not recorded.
Sources describe evidence. Inclusion is not endorsement.