Coexistence of antiferromagnetic ordering and superconductivity in the Ba(Fe0.961Rh0.039)2As2 compound studied by Mossbauer spectroscopy

被引：18

作者：

Wang, P. ^{[1
]}

Stadnik, Z. M. ^{[1
]}

Zukrowski, J. ^{[2
]}

Thaler, A. ^{[3
,4
]}

Bud'ko, S. L. ^{[3
,4
]}

Canfield, P. C. ^{[3
,4
]}

机构：

[1] Univ Ottawa, Dept Phys, Ottawa, ON K1N 6N5, Canada

[2] AGH Univ Sci & Technol, Fac Phys & Appl Comp Sci, Solid State Phys Dept, PL-30059 Krakow, Poland

[3] Iowa State Univ, Ames Lab, US Dept Energy, Ames, IA 50011 USA

[4] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; SPIN-DENSITY-WAVE; HYPERFINE FIELDS; IRON; DISTRIBUTIONS;

D O I：

10.1103/PhysRevB.84.024509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The results of a Fe-57 Mossbauer spectroscopy study between 2.0 and 294 K of superconducting Ba(Fe0.961Rh0.039)(2)As-2 are reported. The main component of the electric field gradient tensor at 294 K is shown to be positive and its increase with decreasing temperature is well described by a T-3/2 power-law relation. The shape of the Mossbauer spectra below the Neel temperature T-N = 55.5(1) K is shown to result from the presence of doping-induced disorder rather than of incommensurate spin-density-wave order. The measured hyperfine magnetic field reaches its maximum value at the critical temperature T-c = 14 K and then decreases by 4.2% upon further cooling to 2.0 K. This constitutes direct evidence of the coexistence of and competition between superconductivity and magnetic order. The extrapolated value of the Fe magnetic moment at 0 K is determined to be 0.35(1) mu(B). The Debye temperature of Ba(Fe0.961Rh0.039)(2)As-2 is found to be 357(3) K.

引用

页数：8

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