Magnetism in Sr$_{2}$CrMoO$_{6}$: A combined abinitio and model study

Prabuddha Sanyal; Anita Halder; Liang Si; Markus Wallerberger; Karsten Held; Tanusri Saha-Dasgupta

doi:10.1103/PhysRevB.94.035132

paper

Magnetism in Sr $_{2}$ CrMoO $_{6}$ : A combined abinitio and model study

arXiv:1608.00380 · doi:10.1103/PhysRevB.94.035132

Abstract

Using a combination of first-principles density functional theory (DFT) calculations and exact diagonalization studies of a first-principles derived model, we carry out a microscopic analysis of the magnetic properties of the half-metallic double perovskite compound, Sr $_{2}$ CrMoO $_{6}$ , a sister compound of the much discussed material Sr $_{2}$ FeMoO $_{6}$ . The electronic structure of Sr $_{2}$ CrMoO $_{6}$ , though appears similar to Sr $_{2}$ FeMoO $_{6}$ at first glance, shows non trivial differences with that of Sr $_{2}$ FeMoO $_{6}$ on closer examination. In this context, our study highlights the importance of charge transfer energy between the two transition metal sites. The change in charge transfer energy due to shift of Cr $d$ states in Sr $_{2}$ CrMoO $_{6}$ compared to Fe $d$ in Sr $_{2}$ FeMoO $_{6}$ suppresses the hybridization between Cr $t_{2 g}$ and Mo $t_{2 g}$ . This strongly weakens the hybridization-driven mechanism of magnetism discussed for Sr $_{2}$ FeMoO $_{6}$ . Our study reveals that, nonetheless, the magnetic transition temperature of Sr $_{2}$ CrMoO $_{6}$ remains high since additional superexchange contribution to magnetism arises with a finite intrinsic moment developed at the Mo site. We further discuss the situation in comparison to another related double perovskite compound, Sr $_{2}$ CrWO $_{6}$ . We also examine the effect of correlation beyond DFT, using dynamical mean field theory (DMFT).

8 pages, 3 figures

Magnetism in Sr $_{2}$ CrMoO $_{6}$ : A combined abinitio and model study

Abstract

References in corpus (8)

Cited by in corpus (2)

Magnetism in Sr2​CrMoO6​: A combined abinitio and model study

Abstract

References in corpus (8)

Cited by in corpus (2)

Magnetism in Sr $_{2}$ CrMoO $_{6}$ : A combined abinitio and model study