Quantum Critical Behavior of the Cluster Glass Phase

Matthew J. Case and V. Dobrosavljević
Phys. Rev. Lett. 99, 147204 – Published 3 October 2007

Abstract

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.

  • Figure
  • Received 6 December 2006

DOI:https://doi.org/10.1103/PhysRevLett.99.147204

©2007 American Physical Society

Authors & Affiliations

Matthew J. Case* and V. Dobrosavljević

  • National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA

  • *case@magnet.fsu.edu
  • Also at Department of Physics, FSU.

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Issue

Vol. 99, Iss. 14 — 5 October 2007

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