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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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.
|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|
|Classification Code:||PACS: 75.10.Jm, 75.10.Pq|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||09 Sep 2011 18:16|
|Last Modified:||26 Dec 2012 13:40|
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