Pati, Swapan K. ; Singh, Rajiv R. P. ; Khomskii, Daniel I. (1998) Alternating spin and orbital dimerization and spin-gap formation in coupled spin-orbital systems Physical Review Letters, 81 (24). pp. 5406-5409. ISSN 0031-9007
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Official URL: http://link.aps.org/doi/10.1103/PhysRevLett.81.540...
Related URL: http://dx.doi.org/10.1103/PhysRevLett.81.5406
Abstract
We discuss a novel mechanism for obtaining a spin-gap state through the creation of a coherent spin-orbital structure in systems with orbital degeneracy. Using the density matrix renormalization group, we calculate the phase diagram for a coupled spin-orbital model. We find that, in addition to ferromagnetic and power-law antiferromagnetic phases for spin and orbital degrees of freedom, this model has a gapless line extending from the ferromagnetic phase to the Bethe ansatz solvable SU(4) critical point, and a gapped phase with doubly degenerate ground states which form alternating spin and orbital singlets. The relevance to several recently discovered materials is discussed.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 60783 |
Deposited On: | 12 Sep 2011 07:06 |
Last Modified: | 12 Sep 2011 07:06 |
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