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Four-spin cyclic exchange in spin ladder cuprates

 

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Opened Access Four-spin cyclic exchange in spin ladder cuprates
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Author: Calzado, C.J.
Graaf, Coen de
Bordas, Esther
Caballol, Rosa
Malrieu, J.P.
Department: Universidad de Sevilla. Departamento de Química Física
Date: 2003
Published in: Physical Review B - Condensed Matter and Materials Physics, 67 (13), 1324091-1324094.
Document type: Article
Abstract: The four-spin cyclic exchange term Jring of three spin-ladder cuprates (SrCu2O3, Sr2Cu3O5, and CaCu2O3) has been calculated from ab initio quantum chemistry calculations. For the first two compounds, a non-negligible cyclic exchange is found, aproximately 20% of the magnetic coupling across the rungs, J⊥, and always larger than the value obtained for two-dimensional La2CuO4 system. In the case of CaCu2O3, the Jring value is quite small, due to the folding of the Cu-O-Cu rung angle, but the Jring/J⊥ ratio is also 0.2 as in the two other systems
Cite: Calzado, C.J., Graaf, C.d., Bordas, E., Caballol, . y Malrieu, J.P. (2003). Four-spin cyclic exchange in spin ladder cuprates. Physical Review B - Condensed Matter and Materials Physics, 67 (13), 1324091-1324094.
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URI: http://hdl.handle.net/11441/48188

DOI: 10.1103/PhysRevB.67.132409

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