首页|Origin of the near-room temperature resistance transition in lutetium with H2/N2 gas mixture under high pressure

Origin of the near-room temperature resistance transition in lutetium with H2/N2 gas mixture under high pressure

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The recent report of room-temperature superconductivity at near-ambient pressure in nitrogen-doped lutetium hydride(Lu-H-N)by Dasenbrock-Gammon et al.[Nature 615,244-250(2023)]has attracted tremendous attention due to its anticipated great impact on technology.However,the results could not be independently reproduced by other groups worldwide in follow-up studies,which elicited intense controversy.Here,we develop a reliable experimental protocol to minimize the extensively concerned extrinsic influences on the sample by starting the reaction from pure lutetium loaded with an H2/N2 gas mixture in a diamond anvil cell under different pressures and temperatures and simultaneously monitoring the entire chemical reaction process using in situ four-probe resistance measurements.Therefore,we could repeatedly reproduce the near-room temperature upsurge of electrical resistance at a relatively early stage of the chemical reaction.However,the mechanism is suggested to be a metal-to-semiconductor/insulator transition associated with the structural modulation in the non-stoichiometric Lu-H-N,rather than superconductivity.

superconductivityhigh pressurelutetium hydrideresistance transitionmetal-to-semiconductor/insulator transition

Di Peng、Qiaoshi Zeng、Fujun Lan、Zhenfang Xing、Zhidan Zeng、Xiaoxing Ke、Yang Ding、Ho-kwang Mao

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Key Laboratory of Materials Physics,Institute of Solid State Physics,Hefei Institutes of Physical Science(HFIPS),Chinese Academy of Sciences,Hefei 230031,China

Science Island Branch,Graduate School of University of Science and Technology of China,Hefei 230026,China

Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China

Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree),Shanghai Advanced Research in Physical Sciences(SHARPS),Shanghai 201203,China

State Key Laboratory of Superhard Materials,Institute of Physics,Jilin University,Changchun 130012,China

College of Materials Science &Engineering,Beijing University of Technology,Beijing 100124,China

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Shanghai Science and Technology Committee,ChinaShanghai Key Laboratory of Novel Extreme Condition Materials,China

22JC141030022dz2260800

2024

10.1093/nsr/nwad337

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ISSN：
年,卷(期)：2024.11(7)