title: Proposed orbital ordering in MnV2O4 from first-principles calculations.
abstract: Based on density functional calculations, we propose a possible orbital ordering in MnV2O4 which consists of orbital chains running along crystallographic a and b directions with orbitals rotated alternatively by about 45 degrees within each chain. We show that the consideration of correlation effects as implemented in the local spin density approximation +U approach is crucial for a correct description of the space group symmetry. This implies that the correlation-driven orbital ordering has a strong influence on the structural transitions in this system. Inclusion of spin-orbit effects does not seem to influence the orbital ordering pattern. We further find that the proposed orbital arrangement favors a noncollinear magnetic ordering of V spins, as observed experimentally. Exchange couplings among V spins are also calculated and discussed.
authors.affiliation: S. N. Bose National Centre for Basic Sciences, Kolkata, India.
authors.forename: S
authors.initials: S
authors.lastname: Sarkar
authors.forename: T
authors.initials: T
authors.lastname: Maitra
authors.forename: Roser
authors.initials: R
authors.lastname: Valentí
authors.forename: T
authors.initials: T
authors.lastname: Saha-Dasgupta