Structural phase transition and the electronic and magnetic properties of Sr{sub 2}FeMoO{sub 6}
Journal Article
·
· Physical Review B
The nuclear and magnetic structures of Sr{sub 2}FeMoO{sub 6} have been investigated using neutron powder diffraction and Mo''ssbauer spectroscopy at temperatures between 10 and 460 K. Fe and Mo atoms are found to order on alternate sites, as expected, giving rise to a double-perovskite-type unit cell. Upon cooling, a structural phase transition from cubic Fm{bar 3}m to tetragonal I4/m occurs at {approx}400 K. In the tetragonal I4/m structure as the temperature decreases, the FeO{sub 6} and MoO{sub 6} octahedra rotate continuously around the c axis by an angle of up to {approx}5.6{sup o}. In the I4/m phase, the magnetic moments for Fe and Mo order ferrimagnetically. The Fe magnetic spins first align along the c direction and then rotate to an angle of {approx}54{sup o} with respect to the c axis; the refined Fe magnetic moment saturates at {approx}4.3{mu}{sub B}. Mo''ssbauer spectroscopy measurements show that the average valence of Fe is intermediate between the high spin configuration values of Fe{sup +2} and Fe{sup +3}. The temperature dependence of the mean hyperfine field is in good agreement with the neutron-diffraction results and gives the same transition temperature.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205654
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 62; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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