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000861462 1001_ $$0P:(DE-Juel1)143858$$aKiani, Amin$$b0
000861462 245__ $$aElectronic correlation and magnetic frustration in Li 2 VOSiO 4 and VOMoO 4
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000861462 520__ $$aLi2VOSiO4 and VOMoO4 have been proposed as realizations of the frustrated two-dimensional J1−J2 quantum Heisenberg model. In this work, in order to test this picture, we study their electronic and magnetic properties by using the local-density approximation + dynamical mean-field theory method. We calculate the magnetic linear response function starting from material-specific Hubbard models and systematically map our results onto those from generalized quantum Heisenberg models. We obtain the effective local magnetic moments and the associated magnetic exchange couplings, in particular the ratio J2/J1, a measure of the frustration degree, and the ratio 2J⊥/(J1+J2), measuring the three-dimensionality degree. Our results support a weak frustration picture for both materials, with small but non-negligible long-range interplane couplings, leading to three-dimensional order at low temperature. Implications for the physics of the two systems are discussed.
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000861462 536__ $$0G:(DE-Juel1)jiff41_20091101$$aMultiplet effects in strongly correlated materials (jiff41_20091101)$$cjiff41_20091101$$fMultiplet effects in strongly correlated materials$$x2
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