Thursday, July 11, 2013

1307.2587 (A. K. Paul et al.)

Lattice Instability and Competing Spin Structures in the Double
Perovskite Insulator Sr2FeOsO6

A. K. Paul, M. Reehuis, V. Ksenofontov, Binghai Yan, A. Hoser, D. M. Toebbens, P. Adler, M. Jansen, C. Felser
The semiconductor Sr2FeOsO6, depending on temperature, adopts two types of antiferromagnetic spin structures that differ in the spin arrangement of the ferrimagnetic iron - osmium layers. Neutron powder diffraction experiments, 57Fe M\"ossbauer spectra, and density-functional theory calculations suggest that this behavior arises because a lattice instability resulting in alternating iron-osmium distances fine-tunes the balance of competing exchange interactions. Thus, Sr2FeOsO6 is an example for a double perovskite, in which the electronic phases are controlled by the interplay of spin, orbital, and lattice degrees of freedom.
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