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Pressure Dependence of Exchange Parameters and Neel Temperature in La 2 CuO 4
Author(s) -
Fishman Anatolii Ya.,
Mitrofanov Valentin Ya.
Publication year - 2008
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.47.3-4.357
Subject(s) - chemistry , antiferromagnetism , superexchange , néel temperature , orthorhombic crystal system , anisotropy , isotropy , condensed matter physics , exchange interaction , thermodynamics , crystallography , ferromagnetism , physics , magnetization , quantum mechanics , crystal structure , magnetic field
Microscopic mechanisms responsible for the observed pressure dependencies of the Neel temperature T N and parameters of isotropic and anisotropic exchange interaction in the orthorhombic antiferromagnet La 2 CuO 4 are investigated. Within the framework of the Anderson microscopic theory of superexchange interaction, the expressions establishing interrelation between parameters of isotropic and anisotropic (both symmetric and antisymmetric) exchange interactions and by the structural parameters describing the Cu‐O‐Cu bonding angle and the Cu‐O bond length in La 2 CuO 4 are obtained. Experimentally determined pressure dependencies of structural parameters by H. Takahashi et al., allow one to present pressure dependencies of exchange parameters and T N in an apparent form.