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Proceedings Paper

Fluctuation-induced first order transition due to Griffiths anomalies of the cluster glass phase
Author(s): Matthew J. Case; V. Dobrosavljević
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Paper Abstract

In itinerant magnetic systems with disorder, the quantum Griffiths phase at T = 0 is unstable to formation of a cluster glass (CG) of frozen droplet degrees of freedom. In the absence of the fluctuations associated with these degrees of freedom, the transition from the paramagnetic Fermi liquid (PMFL) to the ordered phase proceeds via a conventional second-order quantum phase transition. However, when the Griffiths anomalies due to the broad distribution of local energy scales are included, the transition is driven first-order via a novel mechanism for a fluctuation induced first-order transition. At higher temperatures, thermal effects restore the transition to second-order. Implications of the enhanced non-Ohmic dissipation in the CG phase are briefly discussed.

Paper Details

Date Published: 11 June 2007
PDF: 11 pages
Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66001D (11 June 2007); doi: 10.1117/12.724572
Show Author Affiliations
Matthew J. Case, National High Magnetic Field Lab. (United States)
V. Dobrosavljević, National High Magnetic Field Lab. (United States)
Florida State Univ. (United States)


Published in SPIE Proceedings Vol. 6600:
Noise and Fluctuations in Circuits, Devices, and Materials
Massimo Macucci; Lode K.J. Vandamme; Carmine Ciofi; Michael B. Weissman, Editor(s)

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