Quantum Critical Behavior of the Cluster Glass Phase

Details Quantum Critical Behavior of the Cluster Glass Phase Quantum Critical Behavior of the Cluster Glass Phase

2006-12-06

arxiv.org/abs/cond-mat/0612127v2

Phys. Rev. Lett. 99, 147204 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

v1: 4+epsilon pages, 2 figures; v2: 4 pages, 1 figure, improved discussion, version accepted to PRL

Scientific paper

10.1103/PhysRevLett.99.147204

In disordered itinerant magnets with arbitrary symmetry of the order parameter, the conventional quantum critical point between the ordered phase and the paramagnetic Fermi-liquid (PMFL) is destroyed due to the formation of an intervening cluster glass (CG) phase. In this Letter we discuss the quantum critical behavior at the CG-PMFL transition for systems with continuous symmetry. We show that fluctuations due to quantum Griffiths anomalies induce a first-order transition from the PMFL at T=0, while at higher temperatures a conventional continuous transition is restored. This behavior is a generic consequence of enhanced non-Ohmic dissipation caused by a broad distribution of energy scales within any quantum Griffiths phase in itinerant systems.

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