首页|High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K

High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K

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Ternary hydrides have attracted considerable worldwide attention owing to their potential high-temperature superconducting phases.In contrast to previously reported alloy-based ternary hydrides,we selected the rare earth metal yttrium and light element sulfur to form new yttrium-sulfur hydride superconductors as the target at high pressure,which also linked the two categories of binary clathrate YH6 and covalent H3S high-temperature superconductors.The rare earth metal ions served as carrier donors for the dissociation of H2 molecules and the formation of clathrate-like cage structures,while the light elements helped stabilize the materials.By applying high-pressure and high-temperature conditions,two possible ternary hydrides,i.e.,Im(3)m-(Y,S)H6+δ and I4/mmm-(Y,S)H4+δ,were discovered.Im(3 )m-(Y,S)H6+δ is a ternary hydride with a record superconducting transition temperature(Tc)of 235 K belonging to the single-metal hydride system,exhibiting an 11％increment in Te compared with binary Im3m-YH6.In the pressure range of 199-249 GPa,the Tc of this phase displayed a decreasing tendency but with an apparent slope change,indicating the possible structural distortions or electronic structure changes at 227 GPa.Concurrently,the ex-trapolated upper critical magnetic field Hc2 was determined to be 85 T using the Werthamer-Helfand-Hohenberg formula at 199 GPa,with a 37％increment compared with Imi(3)m-YH6.The slight volume expansion(～3％)of Im(3)m-(Y,S)H6+δ compared with that of binary Im3m-YH6 signified the possible interstitial sites of sulfur atoms filling into the hydrogen cages.The size expansion of the center atoms might attract more hydrogen atoms to stabilize the hydrogen cages,contributing to the en-hancement of Tc and Hc2 in Im(3)m-(Y,S)H6+δ.The present study demonstrates that introduction of light elements is an effective way for enhancing Tc by forming larger hydrogen cages.

high pressuresuperconductivityternary hydride

Kexin Zhang、Wuhao Chen、Yuchen Zhang、Jianning Guo、Su Chen、Xiaoli Huang、Tian Cui

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

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

国家重点研发计划国家自然科学基金国家自然科学基金Program far Changjiang Scholars and Innovative Research Team in University中央高校基本科研业务费专项Zhejiang Provincial Science and Technology Innovation Team

2022YFA14055005237225752072188IRT-15R232021R01004

2024

10.1007/s11433-023-2285-3

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(3)
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