Percolation-induced resistivity drop in lutetium dihydride with controllable electrical conductivity over six orders of magnitude

Wang, N. N.; Hou, Jinyu; Liu, Ziyi; Lu, Tenglong; Shan, Pengfei; Chai, Congcong; Jin, Shifeng; Ma, Lishuang; Shi, Lifen; Wang, Xiao; Long, Youwen; Liu, Yue; Zhang, Hua; Dong, Xianlin; Meng, Sheng; Liu, Miao; Cheng, Jinguang

doi:10.1007/s11433-023-2171-8

Cited by 6 publications

(1 citation statement)

References 15 publications

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“…the claimed difficulties in controlling the reaction between lutetium and H 2 /N 2 gas mixture to ensure the correct superconducting phase [ 14 , 16 ], in this work, we employ in situ electrical resistance measurements under high pressure for real-time monitoring of the entire reaction process between a piece of pure lutetium foil and H 2 /N 2 gas mixture under various temperatures and pressures in a diamond anvil cell (DAC) [ 28 ]. On the one hand, we have a ‘clean’ chemical environment and can avoid potential sample contamination, oxidation, damage, or degradation of the synthesized Lu-H-N sample during transferring, manipulation, and loading, usually required for post-fabrication electrical resistance measurements under high pressure [ 29 ]. On the other hand, real-time resistance monitoring can help avoid missing any intermedium states/phases associated with the resistance jump during the reaction.…”

Section: Introductionmentioning

confidence: 99%

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

Peng,

Zeng,

Lan

et al. 2023

National Science Review

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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 excited 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 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 the 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.

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Section: Introductionmentioning

confidence: 99%

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

Peng,

Zeng,

Lan

et al. 2023

National Science Review

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Stabilization of High‐Pressure Phase of Face‐Centered Cubic Lutetium Trihydride at Ambient Conditions

Li,

Wang,

et al. 2024

Advanced Science

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Superconductivity at room temperature and near‐ambient pressures is a highly sought‐after phenomenon in physics and materials science. A recent study reported the presence of this phenomenon in N‐doped lutetium hydride [Nature 615, 244 (2023)], however, subsequent experimental and theoretical investigations have yielded inconsistent results. This study undertakes a systematic examination of synthesis methods involving high temperatures and pressures, leading to insights into the impact of the reaction path on the products and the construction of a phase diagram for lutetium hydrides. Notably, the high‐pressure phase of face‐centered cubic LuH3 (fcc‐LuH3) is maintained to ambient conditions through a high‐temperature and high‐pressure method. Based on temperature and anharmonic effects corrections, the lattice dynamic calculations demonstrate the stability of fcc‐LuH3 at ambient conditions. However, no superconductivity is observed above 2 K in resistance and magnetization measurements in fcc‐LuH3 at ambient pressure. This work establishes a comprehensive synthesis approach for lutetium hydrides, thereby enhancing the understanding of the high‐temperature and high‐pressure method employed in hydrides with superconductivity deeply.

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Observation of non-superconducting phase changes in nitrogen doped lutetium hydrides

Xing,

Wang,

et al. 2023

Nat Commun

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The recent report of near-ambient superconductivity and associated color changes in pressurized nitrogen doped lutetium hydride has triggered worldwide interest and raised major questions about the nature and underlying physics of these latest claims. Here we report synthesis and characterization of high-purity nitrogen doped lutetium hydride LuH2±xNy. We find that pressure conditions have notable effects on Lu-N and Lu-NH chemical bonding and the color changes likely stem from pressure-induced electron redistribution of nitrogen/vacancies and interaction with the LuH2 framework. No superconducting transition is found in all the phases at temperatures 1.8-300 K and pressures 0-38 GPa. Instead, we identify a notable temperature-induced resistance anomaly of electronic origin in LuH2±xNy, which is most pronounced in the pink phase and may have been erroneously interpreted as a sign of superconducting transition. This work establishes key benchmarks for nitrogen doped lutetium hydrides, allowing an in-depth understanding of its novel pressure-induced phase changes.

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Percolation-induced resistivity drop in lutetium dihydride with controllable electrical conductivity over six orders of magnitude

Cited by 6 publications

References 15 publications

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

Stabilization of High‐Pressure Phase of Face‐Centered Cubic Lutetium Trihydride at Ambient Conditions

Observation of non-superconducting phase changes in nitrogen doped lutetium hydrides

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