CONDENSED MATTER

Formation of a gapless quantum spin liquid upon orbital ordering in a chain

S. S. Aplesnin^ab, N. I. Piskunova<sup>a

a</sup> M. F. Reshetnev Siberian State Aerospace University
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences

Abstract: The exchange mechanism of the ordering of electrons on e _g orbitals has been estimated by the quantum Monte Carlo method with the nclusion of the hopping integrals through an anion in a one-dimensional system. A magnetic state in the form of a gapless quantum spin liquid has been found. The plateau existence region in the field-dependence of the magnetization, as well as the wave vector of the modulation of the magnetic structure with Q = π/2 in the (magnetic field-exchange alternating) plane, is determined.

PACS: 73.43.Nq, 75.10.Jm, 75.10.Pq

Received: 05.02.2007
Revised: 14.05.2007

 English version: Journal of Experimental and Theoretical Physics Letters, 2007, 85:12, 644–648

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