首页|High-temperature superconductivity up to 223 K in the Al stabilized metastable hexagonal lanthanum superhydride

High-temperature superconductivity up to 223 K in the Al stabilized metastable hexagonal lanthanum superhydride

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As compressed hydrides constantly refresh the records of superconducting critical temperatures(Tc)in the vicinity of room temperature,this further reinforces the confidence to find more high-temperature superconducting hydrides.In this process,metastable phases of superhydrides offer enough possibilities to access superior superconducting properties.Here we report a metastable hexagonal lanthanum superhydride(P63/mmc-LaHi0)stabilized at 146 GPa by introducing an appropriate proportion of Al,which exhibits high-temperature superconductivity with Tc～178 K,and this value is enhanced to a maximum Tc～223 Kat 164 GPa.Ahuge upper critical magnetic field value Hc2(0)reaches 223 T at 146 GPa.The small volume expansion of P63/mmc-(La,Al)H10 compared with the binary LaH10 indicates the possible interstitial sites of Al atoms filling into the La-H lattice,instead of forming conventional ternary alloy-based superhydrides.This work provides a new strategy for metastable high-temperature superconductors through the multiple-element system.

superhydridemetastablehigh pressuresuperconductivity

Su Chen、Yingcai Qian、Xiaoli Huang、Wuhao Chen、Jianning Guo、Kexin Zhang、Jinglei Zhang、Huiqiu Yuan、Tian Cui

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

High Magnetic Field Laboratory,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China

Center for Correlated Matter,College of Physics,Zhejiang University,Hangzhou 310058,China

School of Physical Science and Technology,Ningbo University,Ningbo 315211,China

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National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaProgram for Changjiang Scholars and Innovative Research Team in Universityusers with the Excellence Program ofHefei Science CenterZhejiang Provincial science and Technology Innovation TeamJilin Provincial Science and Technology Development Project

2022YFA14055001197413352072188IRT_15R23CAS 2021HSC-UE0112021R0100420210509038RQ

2024

10.1093/nsr/nwad107

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ISSN：
年,卷(期)：2024.11(1)
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