Journal
PHYSICAL REVIEW B
Volume 95, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.95.205115
Keywords
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Funding
- Ministry of Education and Science of the Russian Federation [K2-2016-013]
- ECOS-MINCyT France-Argentina [A13E04]
- Austrian Science Fund FWF [F04103, Y746]
- Slovenian Research Agency [P1-0044]
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We theoretically investigate the magnetic properties of Sr2TcO4, a 4d transition-metal layered perovskite of the K2NiF4 type with half-filled t(2g) states. The effect of local Coulomb repulsion between the t(2g) orbitals is included within the density-functional theory (DFT) + U and DFT + dynamical mean-field theory (DMFT) methods. The DFT+ DMFT predicts paramagnetic Sr2TcO4 to be close to the Mott insulator-to-metal transition, similarly to the cubic compound SrTcO3. The intersite exchange interactions computed within the DFT+ DMFT framework point to a strong antiferromagnetic coupling between the neighboring Tc sites within the layer. We then evaluate the Neel temperature T-N within a classical Monte Carlo approach including dipolar interactions, which stabilize the magnetic order in the frustrated K2NiF4 lattice structure. Our approach is validated by applying it to a set of layered and cubic perovskites, for which we obtain T-N in fair agreement with experiment. Within the same approach we obtain the T-N of Sr2TcO4 to be about 450 K. We explore also the effect of anisotropy in exchange interactions due to spin-orbit coupling. These lead to a somewhat higher transition temperature, 550 K.
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