Fluctuation-induced first order transition due to Griffiths anomalies of the cluster glass phase

Matthew J. Case; V. Dobrosavljević

doi:10.1117/12.724572

11 June 2007 Fluctuation-induced first order transition due to Griffiths anomalies of the cluster glass phase

Matthew J. Case, V. Dobrosavljević

Proceedings Volume 6600, Noise and Fluctuations in Circuits, Devices, and Materials; 66001D (2007) https://doi.org/10.1117/12.724572
Event: SPIE Fourth International Symposium on Fluctuations and Noise, 2007, Florence, Italy

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.

Citation Download Citation

Matthew J. Case and V. Dobrosavljević "Fluctuation-induced first order transition due to Griffiths anomalies of the cluster glass phase", Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 66001D (11 June 2007); https://doi.org/10.1117/12.724572

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