Document Type

Article

Publication Version

Published Version

Publication Date

3-15-2014

Journal or Book Title

Physical Review B

Volume

89

Issue

12

First Page

121109(R)

DOI

10.1103/PhysRevB.89.121109

Abstract

The static and the dynamic spin correlations in the low-temperature collapsed tetragonal and the high-temperature tetragonal phase in CaFe2As2 have been investigated by As75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. Through the temperature (T) dependence of the nuclear spin lattice relaxation rates (1/T1) and the Knight shifts, although stripe-type antiferromagnetic (AFM) spin correlations are realized in the high-temperature tetragonal phase, no trace of the AFM spin correlations can be found in the nonsuperconducting, low-temperature, collapsed tetragonal (cT) phase. Given that there is no magnetic broadening in As75 NMR spectra, together with the T-independent behavior of magnetic susceptibility χ and the T dependence of 1/T1Tχ, we conclude that Fe spin correlations are completely quenched statically and dynamically in the nonsuperconducting cT phase in CaFe2As2.

Comments

This article is from Physical Review B 89 (2014): 121109(R), doi:10.1103/PhysRevB.89.121109. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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