Pressure-induced Superconductivity in BiS2-based Superconductors Eu2SrBi2S2.5Se1.5F4

IF 1.5 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Journal of the Physical Society of Japan Pub Date : 2024-01-15 DOI:10.7566/jpsj.93.024706

Kento Ishigaki, Jun Gouchi, Kiyoshi Torizuka, Sonachalam Arumugam, Ashok Kumar Ganguli, Zeba Haque, Kalaiselven Ganesan, Gohil Singh Thakur, Yoshiya Uwatoko

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Abstract

BiS₂-based superconductor Eu₂SrBi₂S_2.5Se_1.5F₄ has been investigated to clarify between T_c and crystal structure under high-pressure. The electrical resistivity by Cubic anvil cell and XRD by Diamond anvil cell were measured by generating hydrostatic pressure. In electrical resistivity measurements, T_c increased from 2.05 to 3.22 K at 1.5 GPa and decreased below 2.62 K at 3 GPa. However, under higher-pressure, T_c exhibited a peak again at 4 GPa. These experimental results suggest the existence of pressure-induced multiple superconducting phases in Eu₂SrBi₂S_2.5Se_1.5F₄. By XRD measurements, we can find that pressure-induced structural phase transitions occur near the pressure in the observation of T_c discontinuities. These results indicate the emergence of new superconducting phases through structural phase transitions. Eu₂SrBi₂S_2.5Se_1.5F₄ was found to have three superconducting phases up to 12 GPa.

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基于 BiS2 的超导体 Eu2SrBi2S2.5Se1.5F4 中的压力诱导超导性

研究了基于 BiS2 的超导体 Eu2SrBi2S2.5Se1.5F4，以阐明高压下 Tc 与晶体结构之间的关系。通过产生静水压力，用立方砧电池测量了电阻率，用金刚石砧电池测量了 XRD。在电阻率测量中，Tc 在 1.5 GPa 时从 2.05 K 上升到 3.22 K，在 3 GPa 时下降到 2.62 K 以下。然而，在更高压力下，Tc 在 4 GPa 时再次出现峰值。这些实验结果表明，Eu2SrBi2S2.5Se1.5F4 中存在压力诱导的多超导相。通过 XRD 测量，我们可以发现压力诱导的结构相变发生在观察 Tc 不连续的压力附近。这些结果表明通过结构相变出现了新的超导相。研究发现，Eu2SrBi2S2.5Se1.5F4 在 12 GPa 以下具有三种超导相。

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来源期刊

Journal of the Physical Society of Japan 物理-物理：综合

CiteScore

3.40

自引率

17.60%

发文量

325

审稿时长

3 months

期刊介绍： The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below. Subjects Covered JPSJ covers all the fields of physics including (but not restricted to) Elementary particles and fields Nuclear physics Atomic and Molecular Physics Fluid Dynamics Plasma physics Physics of Condensed Matter Metal, Superconductor, Semiconductor, Magnetic Materials, Dielectric Materials Physics of Nanoscale Materials Optics and Quantum Electronics Physics of Complex Systems Mathematical Physics Chemical physics Biophysics Geophysics Astrophysics.