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.
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页数：8
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