Frustrated Spin System in theta-(BEDT-TTF)_2RbZn(SCN)_4

Details Frustrated Spin System in theta-(BEDT-TTF)_2RbZn(SCN)_4 Frustrated Spin System in theta-(BEDT-TTF)_2RbZn(SCN)_4

1998-05-15

arxiv.org/abs/cond-mat/9805184v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, to be published in J. Phys. Soc. Jpn. 67 (1998) no. 6

Scientific paper

10.1143/JPSJ.67.1848

The origin of the spin gap behavior in the low-temperature dimerized phase of theta-(BEDT-TTF)_2RbZn(SCN)_4 has been theoretically studied based on the Hartree-Fock approximation for the on-site Coulomb interaction at absolute zero. Calculations show that, in the parameter region considered to be relevant to this compound, antiferromagnetic ordering is stabilized between dimers consisting of pairs of molecules coupled with the largest transfer integral. Based on this result an effective localized spin 1/2 model is constructed which indicates the existence of the frustration among spins. This frustration may result in the formation of spin gap.

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