Emergent Magnetic Degeneracy in Iron Pnictides due to the Interplay between Spin-Orbit Coupling and Quantum Fluctuations

Christensen, Morten H.; Orth, Peter P.; Andersen, Brian M.; Fernandes, Rafael M.

doi:10.1103/PhysRevLett.121.057001

Title: Emergent Magnetic Degeneracy in Iron Pnictides due to the Interplay between Spin-Orbit Coupling and Quantum Fluctuations

Journal Article · Mon Jul 30 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.057001· OSTI ID:1464480

Christensen, Morten H. ^[1]; Orth, Peter P. ^[2]; Andersen, Brian M. ^[3]; Fernandes, Rafael M. ^[1]

Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. of Copenhagen (Denmark). The Niels Bohr Inst.

Recent experiments in iron pnictide superconductors reveal that, as the putative magnetic quantum critical point is approached, different types of magnetic order coexist over a narrow region of the phase diagram. Although these magnetic configurations share the same wave vectors, they break distinct symmetries of the lattice. Importantly, the highest superconducting transition temperature takes place close to this proliferation of near-degenerate magnetic states. In this Letter, we employ a renormalization group calculation to show that such a behavior naturally arises due to the effects of spin-orbit coupling on the quantum magnetic fluctuations. Formally, the enhanced magnetic degeneracy near the quantum critical point is manifested as a stable Gaussian fixed point with a large basin of attraction. Implications of our findings to the superconductivity of the iron pnictides are also discussed.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012336; AC02-07CH11358

OSTI ID:: 1464480

Alternate ID(s):: OSTI ID: 1462154

Report Number(s):: IS-J-9727; PRLTAO; TRN: US1902391

Journal Information:: Physical Review Letters, Vol. 121, Issue 5; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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