Magnetic fluctuations and superconducting properties of CaKFe4As4 studied by As75 NMR

Cui, J.; Ding, Q. -P.; Meier, W. R.; Böhmer, A. E.; Kong, T.; Borisov, V.; Lee, Y.; Bud'ko, S. L.; Valentí, R.; Canfield, P. C.; Furukawa, Y.

doi:10.1103/PhysRevB.96.104512

Title: Magnetic fluctuations and superconducting properties of ${CaKFe}_{4} {As}_{4}$ studied by ${}^{75}{As}$ NMR

Journal Article · Mon Sep 25 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.104512· OSTI ID:1399484

Cui, J. ^[1]; Ding, Q. -P. ^[2]; Meier, W. R. ^[3]; Böhmer, A. E. ^[2]; Kong, T. ^[3]; Borisov, V. ^[4]; Lee, Y. ^[2]; Bud'ko, S. L. ^[3]; Valentí, R. ^[4]; Canfield, P. C. ^[3]; Furukawa, Y. ^[3]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Chemistry
Ames Lab., Ames, IA (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Goethe Univ., Frankfurt (Germany). Inst. of Theoretical Physics

In this paper, we report ⁷⁵As nuclear magnetic resonance (NMR) studies on a new iron-based superconductor, CaKFe₄As₄, with T_c = 35 K. ⁷⁵As NMR spectra show two distinct lines corresponding to the As(1) and As(2) sites close to the K and Ca layers, respectively, revealing that K and Ca layers are well ordered without site inversions. We found that nuclear quadrupole frequencies ν_Q of the As(1) and As(2) sites show an opposite temperature T dependence. Nearly T independent behavior of the Knight shifts K is observed in the normal state, and a sudden decrease in K in the superconducting (SC) state suggests spin-singlet Cooper pairs. ⁷⁵As spin-lattice relaxation rates 1/T₁ show a power-law T dependence with different exponents for the two As sites. The isotropic antiferromagnetic spin fluctuations characterized by the wave vector q = (π, 0) or (0, π) in the single-iron Brillouin zone notation are revealed by 1/T₁T and K measurements. Such magnetic fluctuations are necessary to explain the observed temperature dependence of the ⁷⁵As quadrupole frequencies, as evidenced by our first-principles calculations. Finally, in the SC state, 1/T₁ shows a rapid decrease below T_c without a Hebel-Slichter peak and decreases exponentially at low T, consistent with an s^± nodeless two-gap superconductor.

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Research Organization:: Ames Lab., Ames, IA (United States); 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; SFB/TRR 49

OSTI ID:: 1399484

Alternate ID(s):: OSTI ID: 1394714

Report Number(s):: IS-J9453

Journal Information:: Physical Review B, Vol. 96, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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Title: Magnetic fluctuations and superconducting properties of CaKFe 4 As 4 studied by As 75 NMR

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Title: Magnetic fluctuations and superconducting properties of ${CaKFe}_{4} {As}_{4}$ studied by ${}^{75}{As}$ NMR