Magnetic transition and orbital degrees of freedom in vanadium spinels

Details Magnetic transition and orbital degrees of freedom in vanadium spinels Magnetic transition and orbital degrees of freedom in vanadium spinels

2003-05-12

arxiv.org/abs/cond-mat/0305269v1

Phys. Rev. B 68, 060405(R) (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.060405

We propose a scenario for the two phase transitions in $A$V$_2$O$_4$ ($A$=Zn, Mg, Cd), based on an effective spin-orbital model on the pyrochlore lattice. At high temperatures, spin correlations are strongly frustrated due to the lattice structure, and the transition at $\sim$50 [K] is an orbital order, supported by Jahn-Teller lattice distortion. This orbital order introduces spatial modulation of spin exchange couplings depending on the bond direction. This partially releases the frustration, and leads to a spin order at $\sim$40 [K]. We also study the stable spin configuration by taking account of third-neighbor exchange couplings and quantum fluctuations. The result is consistent with the experimental results.

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