Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00

Authors

W. N. Rowan-Weetaluktuk, McGill University
D. H. Ryan, McGill UniversityFollow
J. M. Cadogan, University of Manitoba
R. Hu, Iowa State UniversityFollow
S. L. Bud’ko, Iowa State UniversityFollow
Paul C. Canfield, Iowa State UniversityFollow

Date of this Version

2012

Citation

Journal Of Applied Physics 111, 07e126 (2012); doi:10.1063/1.3673848

Abstract

⁵⁷Fe Mössbauer spectroscopy was used to study single-crystals of K_0.8Fe_1.76Se_2.00 from 6K to 673 K. At 6 K, the hyperfine field (B_hf) is canted away from the c-axis by 18±3°. The temperature dependence of B_hf follows a spin wave model with a spin excitation gap of 9±1 meV. A sudden increase in the line width and a corresponding drop in (1/2)eQV_zz at T_N = 532 K are indications of strong coupling between the magnetic and structural transitions.