Antiferromagnetic interactions in the quarter-filled organic conductor (EDO-TTF)2PF6
Literature Information
Michael Filatov
The ground state electronic structure of the high-temperature (HT) and the low-temperature (LT) phases of (EDO-TTF)2PF6 is investigated using the embedded cluster approach in combination with the density functional method designed to describe the strong non-dynamic electron correlation. It is found that, in the HT phase, the unpaired electron spins located on pairs of neighbouring EDO-TTF molecules are antiferromagnetically coupled along the stacking direction with the Heisenberg exchange integral J = −655 cm−1. In the LT phase, the unpaired spins located on the cationic EDO-TTF molecules are coupled antiferromagnetically with J values strongly alternating along the stacking axis of the crystal thus rendering it diamagnetic. The parameters of the extended Hubbard model are evaluated and the conductance properties of the two phases are estimated using these parameters. It is suggested to investigate the charge and spin excitations in the two phases of (EDO-TTF)2PF6 with the use of angle-resolved photoemission spectroscopy.
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