Physics – Condensed Matter – Materials Science
Scientific paper
2010-07-03
EPL,vol. 92, p. 17007 (2010)
Physics
Condensed Matter
Materials Science
6 pages, 2 figures; Revised version, accepted for publication in EPL. The physics underlying the proposed mechanisms is more d
Scientific paper
10.1209/0295-5075/92/17007
We report magnetization measurements and magnetic resonance data for SrTiO3 doped by manganese. We show that the recently reported coexistent spin and dipole glass (multiglass) behaviours are strongly affected by the distribution of Mn ions between the Sr and Ti sites. Motivated by this finding we calculate the magnetic interactions between Mn impurities of different kinds. Both LSDA+U and many-body perturbation theory evidence that magnetic and magnetoelectric interactions are mediated by Mn$_B^{4+}$ ions substituting for Ti. We propose two microscopic magnetoelectric coupling mechanisms, which can be involved in all magnetoelectric systems based on incipient ferroelectrics. In the first one, the electric field modifies the spin susceptibility via spin-strain coupling of Mn$_{B}^{4+}$. The second mechanism concerns Mn pairs coupled by the position-dependent exchange interaction.
Dare Anne-Marie
Garmash E. P.
Hayn Roland
Kondakova I. V.
Kuzian R. O.
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