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Suppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by As-75 NMR/NQR measurements

TitleSuppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by As-75 NMR/NQR measurements
Publication TypeJournal Article
Year of Publication2014
AuthorsFurukawa, Y, Roy, B, Ran, S, Bud'ko, SL, Canfield, PC
JournalPhysical Review B
Volume89
Pagination121109
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000333126000001
Keywordssuperconductivity
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 As-75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. Through the temperature (T) dependence of the nuclear spin lattice relaxation rates (1/T-1) 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 As-75 NMR spectra, together with the T-independent behavior of magnetic susceptibility chi and the T dependence of 1/T1T chi, we conclude that Fe spin correlations are completely quenched statically and dynamically in the nonsuperconducting cT phase in CaFe2As2.

DOI10.1103/PhysRevB.89.121109
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