Quantum Critical Behavior of the Cluster Glass Phase
arXiv:cond-mat/0612127 · doi:10.1103/PhysRevLett.99.147204
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.
arXiv commentv1: 4+epsilon pages, 2 figures; v2: 4 pages, 1 figure, improved discussion, version accepted to PRL
References in corpus (10)
- Rare region effects at classical, quantum, and non-equilibrium phase transitions
- Infinite-randomness quantum Ising critical fixed points
- Disorder-Driven Non-Fermi Liquid Behavior of Correlated Electrons
- A Solvable Spin-Glass of Quantum Rotors
- Disorder-induced rounding of certain quantum phase transitions
- Quantum Griffiths effects in itinerant Heisenberg magnets
- Melting of the Electron Glass
- On quantum Griffiths effects in metallic systems
- Absence of conventional quantum phase transitions in itinerant systems with disorder
- Finite Temperature and Dynamical Properties of the Random Transverse-Field Ising Spin Chain
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- Typical-Medium Theory of Mott-Anderson Localization
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- A theoretical study of the cluster glass-Kondo-magnetic disordered alloys