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

P. Wang; Z. M. Stadnik; J. Żukrowski; A. Thaler; S. L. Bud’ko; P. C. Canfield

doi:10.1103/PhysRevB.84.024509

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

P. Wang, Z. M. Stadnik, J. Żukrowski, A. Thaler, S. L. Bud’ko, P. C. Canfield

DOI 10.1103/PhysRevB.84.024509 · Physical Review B

T1

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Abstract

The results of a Fe57 Mössbauer spectroscopy study between 2.0 and 294 K of superconducting Ba(Fe0.961Rh0.039)2As2 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 T3/2 power-law relation. The shape of the Mössbauer spectra below the Néel temperature TN=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 Tc=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) μB. The Debye temperature of Ba(Fe0.961Rh0.039)2As2 is found to be 357(3) K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ba(Fe0.961Rh0.039)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure not reported	unknown