Crystal structure and phase transitions at high pressures in the superconductor FeSe0.89S0.11

被引：1

作者：

Nikiforova, Yulia A. ^{[1
]}

Ivanova, Anna G. ^{[1
]}

Frolov, Kirill, V ^{[1
]}

Lyubutin, Igor S. ^{[1
]}

Chareev, Dmitriy A. ^{[2
]}

Baskakov, Arseniy O. ^{[1
]}

Starchikov, Sergey S. ^{[1
]}

Troyan, Ivan A. ^{[1
]}

Lyubutina, Mariana, V ^{[1
]}

Naumov, Pavel G. ^{[1
]}

Abdel-Hafiez, Mahmoud ^{[3
]}

机构：

[1] Russian Acad Sci, Shubnikov Inst Crystallog FSRC Crystallog & Photo, Moscow 119333, Russia

[2] Russian Acad Sci, Inst Expt Mineral, Chernogolovka 142432, Moscow Region, Russia

[3] Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 860卷

基金：

瑞典研究理事会; 俄罗斯科学基金会;

关键词：

Iron-based superconductors; High pressure; Single crystal X-ray diffraction; Powder X-ray diffraction; Structural phase transition;

D O I：

10.1016/j.jallcom.2020.158419

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report on the structural phase transitions in the FeSe0.89S0.11 superconductor with T-C = 11 K observed by powder synchrotron X-ray diffraction at high pressures up to 18.5 GPa under compression and decompression modes. It was found that at ambient pressure and room temperature, FeSe0.89S0.11 has a tetragonal structure (space group NM). Under compression, in the region of 10 GPa, a phase transition from the tetragonal into the orthorhombic structure (sp. gr . Pnma) is observed, which persists up to 18.5 GPa. Our results strongly suggest that, at decompression, as the applied pressure decreases to 6 GPa and then is completely removed, most of the sample recrystallizes into the hexagonal phase of the structural type NiAs (sp. gr . P6(3)/mmc). However, the other part of the sample remains in the high pressure orthorhombic phase (sp. gr . Pnma), while the tetragonal phase (sp. gr . P4/n) is not restored. These observations illustrate a strong hysteresis of the structural properties of FeSe0.89S0.11 during a phase transition under pressure. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8

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