Exchange and spin Jahn-Teller distortions for a triangular cluster of spin-1/2

Details Exchange and spin Jahn-Teller distortions for a triangular cluster of spin-1/2 Exchange and spin Jahn-Teller distortions for a triangular cluster of spin-1/2

2005-12-25

arxiv.org/abs/cond-mat/0512642v3

J. Phys. Soc. Jpn 75 (2006) 044704

Physics

Condensed Matter

Other Condensed Matter

4 pages, 1 figure. Accepted by JPSJ. Clarified some setences. Corrected typos

Scientific paper

10.1143/JPSJ.75.044704

We study the effects of magnetoelastic coupling on the degenerate ground state of the spin-1/2 antiferromagnetic Heisenberg model for the regular triangular spin cluster. Static displacement of spins spontaneously lifts the degeneracy of the ground state through the distance dependence of exchange coupling, i.e., a spin Jahn-Teller mechanism takes place. On the other hand, dynamical displacement does not lift the degeneracy, though the cluster distorts spontaneously. The energy decrease obtained by dynamical theory is twice as large as that obtained by static theory because of quantum fluctuation.

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