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Title: Evolution from B2g Nematics to B1g Nematics in Heavily Hole-Doped Iron-Based Superconductors

Journal Article · · Physical Review Letters

Recent experiments reported an unusual nematic behavior of heavily hole-doped pnictides AFe2As2, with alkali A = Rb, Cs. In contrast to the B2g nematic order of the parent AeFe2As2 compounds (with alkaline earth Ae = Sr, Ba), characterized by unequal nearest-neighbor Fe-Fe bonds, in the hole-doped systems nematic order is observed in the B1g channel, characterized by unequal next-nearest-neighbor Fe-Fe (diagonal Fe-As-Fe) bonds. In this Letter, using density functional theory, we attribute this behavior to the evolution of the magnetic ground state along the series Ae1–xAxFe2As2, from single stripes for small x to double stripes for large x. Our simulations using the reduced Stoner theory show that fluctuations of Fe moments are essential for the stability of the double-stripe configuration. Furthermore, we propose that the change in the nature of the magnetic ground state is responsible for the change in the symmetry of the vestigial nematic order that it supports.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012336
OSTI ID:
1611768
Journal Information:
Physical Review Letters, Vol. 123, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (1)

Novel electronic nematicity in heavily hole-doped iron pnictide superconductors journal March 2020