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
• SPECIAL TOPIC—Celebrating the 70th Anniversary of the Physics of Jilin University • 上一篇 下一篇
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,§
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,§
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.
中图分类号: (High-pressure effects in solids and liquids)