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arxiv cond-mat/0611502 v3 pith:VKJP3YPV submitted 2006-11-19 cond-mat.mtrl-sci cond-mat.str-el

Magnetic coupling in CoCr₂O₄ and MnCr₂O₄: an LSDA+U study

classification cond-mat.mtrl-sci cond-mat.str-el
keywords couplingmagneticconstantslsdacocrmncrpossiblespinel
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present a first principles LSDA+U study of the magnetic coupling constants in the spinel magnets CoCr_2O_4 and MnCr_2O_4. Our calculated coupling constants highlight the possible importance of AA interactions in spinel systems with magnetic ions on both A and B sites. Furthermore, we show that a careful analysis of the dependence of the magnetic coupling constants on the LSDA+U parameters provides valuable insights in the underlying coupling mechanisms, and allows to obtain a quantitative estimate of the magnetic coupling constants. We discuss in detail the capabilities and possible pitfalls of the LSDA+U method in determining magnetic coupling constants in complex transition metal oxides.

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