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.