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Abstract:
The semiconductor Sr2FeOsO6, depending on temperature, adopts two types of spin structures that
differ in the spin sequence of ferrimagnetic iron-osmium layers along the tetragonal c axis. Neutron
powder diffraction experiments, 57Fe Mo¨ssbauer 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 of a double
perovskite, in which the electronic phases are controlled by the interplay of spin, orbital, and lattice
degrees of freedom.
