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Title: Conventional empirical law reverses in the phase transitions of 122-type iron-based superconductors

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep07172· OSTI ID:1164958
 [1];  [2];  [3];  [4];  [3];  [1];  [5];  [6];  [7];  [8];  [9];  [10];  [11]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Jilin Univ., Changchun (China); Carnegie Institute of Washington, Argonne, IL (United States)
  3. Harbin Institute of Technology, Harbin (China)
  4. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); Harbin Institute of Technology, Harbin (China)
  5. Carnegie Institute of Washington, Argonne, IL (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China)
  7. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  8. Collaborative Innovation Center of Quantum Matter, Beijing (China); Peking Univ., Beijing (China)
  9. Chinese Academy of Sciences (CAS), Shanghai (China)
  10. Univ. of Nevada, Las Vegas, NV (United States)
  11. 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
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Suppression of superconductivity and structural phase transitions under pressure in tetragonal FeS journal August 2016
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Superconducting and magnetic phase diagram of RbEuFe 4 As 4 and CsEuFe 4 As 4 at high pressure journal July 2018