Conventional empirical law reverses in the phase transitions of 122-type iron-based superconductors
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Jilin Univ., Changchun (China); Carnegie Institute of Washington, Argonne, IL (United States)
- Harbin Institute of Technology, Harbin (China)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Harbin Institute of Technology, Harbin (China)
- Carnegie Institute of Washington, Argonne, IL (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Collaborative Innovation Center of Quantum Matter, Beijing (China); Peking Univ., Beijing (China)
- Chinese Academy of Sciences (CAS), Shanghai (China)
- Univ. of Nevada, Las Vegas, NV (United States)
- Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Carnegie Institute of Washington, Argonne, IL (United States)
Phase transition of solid-state materials is a fundamental research topic in condensed matter physics, materials science and geophysics. It has been well accepted and widely proven that isostructural compounds containing different cations undergo same pressure-induced phase transitions but at progressively lower pressures as the cation radii increases. However, we discovered that this conventional law reverses in the structural transitions in 122-type iron-based superconductors. In this report, a combined low temperature and high pressure X-ray diffraction (XRD) measurement has identified the phase transition curves among the tetragonal (T), orthorhombic (O) and the collapsed-tetragonal (cT) phases in the structural phase diagram of the iron-based superconductor AFe2As2 (A = Ca, Sr, Eu, and Ba). As a result, the cation radii dependence of the phase transition pressure (T → cT) shows an opposite trend in which the compounds with larger ambient radii cations have a higher transition pressure.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; SC0001057
- OSTI ID:
- 1164958
- Alternate ID(s):
- OSTI ID: 1210834
- Journal Information:
- Scientific Reports, Vol. 4, Issue 11, 2014; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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