Random quantum magnets with broad disorder distribution

D. Karevski, Y-C. Lin, H. Rieger, N. Kawashima and F. Iglói
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D. Karevski: Laboratoire de Physique des Matériaux, Université Henri Poincaré (Nancy 1), BP 239, 54506 Vandœuvre lès Nancy Cedex, France
Y-C. Lin: NIC, Forschungszentrum Jülich, 52425 Jülich, Germany
H. Rieger: Theoretische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany
N. Kawashima: Department of Physics, Tokyo Metropolitan University, 192-0397 Tokyo, Japan
F. Iglói: Laboratoire de Physique des Matériaux, Université Henri Poincaré (Nancy 1), BP 239, 54506 Vandœuvre lès Nancy Cedex, France

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 2, 267-276

Abstract: Abstract: We study the critical behavior of Ising quantum magnets with broadly distributed random couplings (J), such that P(ln J) ∼ | ln J|-1 - α, α > 1, for large | ln J| (Lévy flight statistics). For sufficiently broad distributions, α

Keywords: PACS. 75.50.Lk Spin glasses and other random magnets – 05.30.Ch Quantum ensemble theory – 75.10.Nr Spin-glass and other random models – 75.40.Gb Dynamic properties (dynamic susceptibility; spin waves; spin diffusion; dynamic scaling; etc.) (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/PL00011100

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