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Title: Trends in pressure-induced layer-selective half-collapsed tetragonal phases in the iron-based superconductor family A e A Fe 4 As 4

Journal Article · · Physical Review B
 [1];  [2];  [1]
  1. Goethe Univ. Frankfurt (Germany). Inst. of Theoretical Physics
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

In this paper, by performing pressure simulations within density functional theory for the family of iron-based superconductors A e A Fe 4 As 4 with A e = Ca , Sr, Ba and A = K , Rb, Cs we predict in these systems the appearance of two consecutive half-collapsed tetragonal transitions at pressures P c 1 and P c 2 , which have a different character in terms of their effect on the electronic structure. We find that, similar to previous studies for CaKFe 4 As 4 , spin-vortex magnetic fluctuations on the Fe sublattice play a key role for an accurate structure prediction in these materials at zero pressure. We identify clear trends of critical pressures and discuss the relevance of the collapsed phases in connection to magnetism and superconductivity. The intriguing cases of EuRbFe 4 As 4 and EuCsFe 4 As 4 , where Eu magnetism coexists with superconductivity, are discussed as well in the context of half-collapsed phases.

Research Organization:
Ames Lab. and Iowa State Univ., Ames, IA (United States); Goethe Univ. Frankfurt (Germany)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (United States); German Research Foundation (DFG)
Grant/Contract Number:
AC02-07CH11358; GBMF4411
OSTI ID:
1469156
Alternate ID(s):
OSTI ID: 1466433
Report Number(s):
IS-J 9732
Journal Information:
Physical Review B, Vol. 98, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright 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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