Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2007-07-04
Proc. SPIE Vol. 6600, 66001D (2007)
Physics
Condensed Matter
Disordered Systems and Neural Networks
11 pages, 5 figures, paper to appear in the Proceedings of SPIE International Conference "Fluctuations and Noise 2007", Floren
Scientific paper
10.1117/12.724572
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.
Case Matthew J.
Dobrosavljevic Vlad
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