The relation between local structural distortion and the low-temperature magnetic anomaly in Fe<sub>7</sub>S<sub>8</sub>.

Koulialias, D; Canévet, E; Charilaou, M; Weidler, P G; Löffler, J F; Gehring, A U

The relation between local structural distortion and the low-temperature magnetic anomaly in Fe₇S₈.

Koulialias, D; Canévet, E; Charilaou, M; Weidler, P G; Löffler, J F; Gehring, A U.

Afiliación

Koulialias D; Department of Earth Sciences, Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland.

J Phys Condens Matter ; 30(42): 425803, 2018 Oct 24.

Article en En | MEDLINE | ID: mdl-30187891

RESUMEN

Structural defects on an atomic level can crucially impact the magnetic properties of a material. We study this phenomenon by means of magnetometry and powder neutron diffraction on a stoichiometric, monoclinic pyrrhotite (Fe7S8), which is a classic omission structure with a magnetic anomaly at about 30 K. The initial structural distortion of the pyrrhotite at 300 K caused by the vacancy arrangement decreases upon cooling, and simultaneous to the magnetic anomaly the anisotropic contraction of the unit cell homogenizes the covalency of the Fe-Fe bonds with lengths less than 3.0 Å and the Fe-S-Fe bond angles. These changes on the atomic level affect the spin-orbit coupling and the super-exchange interactions in Fe7S8, and trigger the low-temperature magnetic anomaly within a crystallographically stable system.

Texto completo

Añadir a Mi BVS

Imprimir

XML

PubMed Links

Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Phys Condens Matter Asunto de la revista: BIOFISICA Año: 2018 Tipo del documento: Article País de afiliación: Suiza Pais de publicación: Reino Unido

Texto completo

Añadir a Mi BVS

Imprimir

XML

PubMed Links

Buscar en Google