Rong Yu et al 2008 New J. Phys. 10 013034 doi:10.1088/1367-2630/10/1/013034
Field induced disordered-local-moment phase in site-diluted spin-gap antiferromagnets
Rong Yu1, Tommaso Roscilde2 and Stephan Haas1
Show affiliationsSite dilution of spin-gapped antiferromagnets leads to localized free moments, which can order antiferromagnetically in two and higher dimensions. Here we show how a weak magnetic field drives this order-by-disorder state into a novel disordered-local-moment (DLM) phase, characterized by the formation of local singlets between neighboring moments and by localized moments aligned antiparallel to the field. This disordered phase is characterized by the absence of a gap, as is the case in a Bose glass. The associated field-driven quantum phase transition is consistent with the universality of a superfluid-to-Bose-glass transition. The robustness of the DLM phase and its prominent features, in particular a series of pseudo-plateaus in the magnetization curve, makes it accessible and relevant to experiments.
- PACS
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75.30.Cr Saturation moments and magnetic susceptibilities
64.70.P- Glass transitions of specific systems
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
- Subjects
- Dates
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Issue 1 (January 2008)
Received 2 October 2007
Published 25 January 2008
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Field induced disordered-local-moment phase in site-diluted spin-gap antiferromagnets
Rong Yu et al 2008 New J. Phys. 10 013034
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