Abstract
The perovskite exhibits unique magnetostructural properties among the rest of ferromagnetic (FM)/metallic compounds. The sudden orthorhombic-tetragonal structural transition produces an unusual magnetic behavior vs temperature and external magnetic fields. The symmetry change is responsible for a spontaneous spin rotation in this metallic oxide. We have studied half-doped cobaltites varying the ionic radius of A-site cations (divalent cations and lanthanides) to complete the T- phase diagram. The influence of the structural distortion and the A-cation size for the occurrence of a spontaneous spin reorientation in the metallic state has been investigated. As the magnetization reorientation is driven by the temperature-induced collapse of the orthorhombic distortion, a careful investigation of the structural symmetry is presented, varying the structural distortion of the Sr-rich half-doped cobaltites by means of both compositional and temperature changes. The region in the phase diagram of these FM/metallic cobaltites where magnetic symmetry replaces was determined. In that region, the magnetization direction has rotated 45 ° within the plane from the former to the latter.
6 More- Received 9 March 2021
- Revised 14 July 2021
- Accepted 14 July 2021
DOI:https://doi.org/10.1103/PhysRevB.104.054411
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