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

被引：29

作者：

Furukawa, Y. ^{[1
]}

Roy, B.

Ran, S.

Bud'ko, S. L.

Canfield, P. C.

机构：

[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 12期

关键词：

SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevB.89.121109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

共 41 条

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