Synthesis and superconductivity in yttrium superhydrides under high pressure

doi:10.1088/1674-1056/ac872e

中国物理B ›› 2022, Vol. 31 ›› Issue (10): 106201-106201.doi: 10.1088/1674-1056/ac872e

所属专题： SPECIAL TOPIC — Celebrating the 70th Anniversary of the Physics of Jilin University

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Synthesis and superconductivity in yttrium superhydrides under high pressure

Yingying Wang(王莹莹)^1,2, Kui Wang(王奎)^1,2, Yao Sun(孙尧)^1,2, Liang Ma(马良)^1,2,3, Yanchao Wang(王彦超)^1,2, Bo Zou(邹勃)¹, Guangtao Liu(刘广韬)^2,†, Mi Zhou(周密)^2,‡, and Hongbo Wang(王洪波)^1,2,§

1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
2. International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China;
3. International Center of Future Science, Jilin University, Changchun 130012, China

收稿日期:2022-05-15 修回日期:2022-07-19 出版日期:2022-10-16 发布日期:2022-09-16
通讯作者: Guangtao Liu, Mi Zhou, Hongbo Wang E-mail:liuguangtao@jlu.edu.cn;mzhou@jlu.edu.cn;whb2477@jlu.edu.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFA1400203 and 2018YFA0305900), the National Natural Science Foundation of China (Grant Nos. 52090024, 11874175, 12074139, 12074138, 11874176, and 12034009), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), and Program for JLU Science and Technology Innovative Research Team (JLUSTIRT).

Synthesis and superconductivity in yttrium superhydrides under high pressure

1. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
2. International Center of Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China;
3. International Center of Future Science, Jilin University, Changchun 130012, China

Received:2022-05-15 Revised:2022-07-19 Online:2022-10-16 Published:2022-09-16
Contact: Guangtao Liu, Mi Zhou, Hongbo Wang E-mail:liuguangtao@jlu.edu.cn;mzhou@jlu.edu.cn;whb2477@jlu.edu.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2021YFA1400203 and 2018YFA0305900), the National Natural Science Foundation of China (Grant Nos. 52090024, 11874175, 12074139, 12074138, 11874176, and 12034009), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33000000), and Program for JLU Science and Technology Innovative Research Team (JLUSTIRT).

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摘要/Abstract

摘要： Flourishing rare earth superhydrides are a class of recently discovered materials that exhibit near-room-temperature superconductivity at high pressures, ushering in a new era of superconductivity research at high pressures. Yttrium superhydrides drew the most attention among these superhydrides due to their abundance of stoichiometries and excellent superconductivities. Here, we carried out a comprehensive study of yttrium superhydrides in a wide pressure range of 140 GPa—300 GPa. We successfully synthesized a series of superhydrides with the compositions of YH₄, YH₆, YH₇, and YH₉, and reported superconducting transition temperatures of 82 K at 167 GPa, 218 K at 165 GPa, 29 K at 162 GPa, and 230 K at 300 GPa, respectively, as evidenced by sharp drops in resistance. The structure and superconductivity of YH₄ were taken as a representative example and were also examined using x-ray diffraction measurements and the superconductivity suppression under external magnetic fields, respectively. Clathrate YH₁₀, a candidate for room-temperature superconductor, was not synthesized within the study pressure and temperature ranges of up to 300 GPa and 2000 K. The current study established a detailed foundation for future research into room-temperature superconductors in polynary yttrium-based superhydrides.

关键词: high pressure, superhydride, superconductivity

Abstract: Flourishing rare earth superhydrides are a class of recently discovered materials that exhibit near-room-temperature superconductivity at high pressures, ushering in a new era of superconductivity research at high pressures. Yttrium superhydrides drew the most attention among these superhydrides due to their abundance of stoichiometries and excellent superconductivities. Here, we carried out a comprehensive study of yttrium superhydrides in a wide pressure range of 140 GPa—300 GPa. We successfully synthesized a series of superhydrides with the compositions of YH₄, YH₆, YH₇, and YH₉, and reported superconducting transition temperatures of 82 K at 167 GPa, 218 K at 165 GPa, 29 K at 162 GPa, and 230 K at 300 GPa, respectively, as evidenced by sharp drops in resistance. The structure and superconductivity of YH₄ were taken as a representative example and were also examined using x-ray diffraction measurements and the superconductivity suppression under external magnetic fields, respectively. Clathrate YH₁₀, a candidate for room-temperature superconductor, was not synthesized within the study pressure and temperature ranges of up to 300 GPa and 2000 K. The current study established a detailed foundation for future research into room-temperature superconductors in polynary yttrium-based superhydrides.

Key words: high pressure, superhydride, superconductivity

中图分类号: (High-pressure effects in solids and liquids)

62.50.-p

74.70.-b (Superconducting materials other than cuprates) 05.70.Fh (Phase transitions: general studies) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)

Yingying Wang(王莹莹), Kui Wang(王奎), Yao Sun(孙尧), Liang Ma(马良), Yanchao Wang(王彦超), Bo Zou(邹勃), Guangtao Liu(刘广韬), Mi Zhou(周密), and Hongbo Wang(王洪波). Synthesis and superconductivity in yttrium superhydrides under high pressure[J]. 中国物理B, 2022, 31(10): 106201-106201.

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Synthesis and superconductivity in yttrium superhydrides under high pressure

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