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Impurity effects in highly frustrated diamond-lattice antiferromagnets

Savary, Lucile and Gull, Emanuel and Trebst, Simon and Alicea, Jason and Bergman, Doron and Balents, Leon (2011) Impurity effects in highly frustrated diamond-lattice antiferromagnets. Physical Review B, 84 (6). Art. No. 064438. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:20110909-110431469

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Abstract

We consider the effects of local impurities in highly frustrated diamond-lattice antiferromagnets, which exhibit large but nonextensive ground-state degeneracies. Such models are appropriate to many A-site magnetic spinels. We argue very generally that sufficiently dilute impurities induce an ordered magnetic ground state and provide a mechanism of degeneracy breaking. The states that are selected can be determined by a “swiss cheese model” analysis, which we demonstrate numerically for a particular impurity model in this case. Moreover, we present criteria for estimating the stability of the resulting ordered phase to a competing frozen (spin glass) one. The results may explain the contrasting finding of frozen and ordered ground states in CoAl_2O_4 and MnSc_2S_4, respectively.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevB.84.064438 DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevB.84.064438PublisherUNSPECIFIED
http://arxiv.org/abs/1103.4985arXivUNSPECIFIED
Additional Information:© 2011 American Physical Society. Received 25 March 2011; revised manuscript received 23 June 2011; published 29 August 2011. We thank Leo Radzihovsky for extensive discussions during the prehistory of this project. L.B. was supported by the Packard Foundation and National Science Foundation through Grants No. DMR-0804564 and No. PHY05-51164. J.A. acknowledges support from the National Science Foundation through Grant No. DMR-1055522.
Group:IQIM, Institute for Quantum Information and Matter
Funders:
Funding AgencyGrant Number
Packard Foundation UNSPECIFIED
NSFDMR-0804564
NSFPHY05-51164
NSFDMR-1055522
Classification Code:PACS: 75.10.Jm, 75.10.Pq
Record Number:CaltechAUTHORS:20110909-110431469
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110909-110431469
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25271
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Sep 2011 18:16
Last Modified:26 Dec 2012 13:40

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