Quantum Griffiths effects in itinerant Heisenberg magnets

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dc.creatorVojta, Thomas
dc.creatorSchmalian, Joerg
dc.date2004-05-26
dc.date2005-07-19
dc.date.accessioned2026-07-07T02:58:21Z
dc.date.available2026-07-07T02:58:21Z
dc.descriptionWe study the influence of quenched disorder on quantum phase transitions in itinerant magnets with Heisenberg spin symmetry, paying particular attention to rare disorder fluctuations. In contrast to the Ising case where the overdamping suppresses the tunneling of the rare regions, the Heisenberg system displays strong power-law quantum Griffiths singularities in the vicinity of the quantum critical point. We discuss these phenomena based on general scaling arguments, and we illustrate them by an explicit calculation for O(N) spin symmetry in the large-N limit. We also discuss broad implications for the classification of quantum phase transitions in the presence of quenched disorder.
dc.description6 pages, 1 eps figure, final version as published
dc.identifierhttps://arxiv.org/abs/cond-mat/0405609
dc.identifierhttp://arxiv.org/abs/cond-mat/0405609
dc.identifierPhys. Rev. B 72, 045438 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.045438
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24053
dc.subjectStrongly Correlated Electrons
dc.subjectDisordered Systems and Neural Networks
dc.titleQuantum Griffiths effects in itinerant Heisenberg magnets
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