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Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings

Yang, Kun and Bhatt, R. N. (1998) Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings. Physical Review Letters, 80 (20). pp. 4562-4565. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:YANprl98

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Abstract

We study the spin-1 chain with nearest neighbor couplings that are rotationally invariant, but include both Heisenberg and biquadratic exchange, with random strengths. We demonstrate, using perturbative renormalization group methods as well as exact diagonalization of clusters, that the system generates ferromagnetic couplings under certain circumstances even when all the bare couplings are antiferromagnetic. This disorder induced instability leads to formation of large magnetic moments at low temperatures, and is a purely quantum mechanical effect that does not have a classical counterpart. The physical origin of this instability, as well as its consequences, are discussed.


Item Type:Article
Additional Information:©1998 The American Physical Society Received 22 December 1997 This work was supported by NSF Grant No. DMR-9400362 (at Princeton), as well as support from Caltech, and the Aspen Center for Physics.
Record Number:CaltechAUTHORS:YANprl98
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:YANprl98
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.80.4562
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5197
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:04 Oct 2006
Last Modified:26 Dec 2012 09:04

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