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APS » Journals » Phys. Rev. B » Volume 63 » Issue 17
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Phys. Rev. B 63, 174428 (2001) [14 pages]

Quantum critical behavior in disordered itinerant ferromagnets: Logarithmic corrections to scaling

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D. Belitz
Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403

T. R. Kirkpatrick
Institute for Physical Science and Technology and Department of Physics, University of Maryland, College Park, Maryland 20742

Maria Teresa Mercaldo
Institute for Physical Science and Technology, and Department of Physics, University of Maryland, College Park, Maryland 20742
Dipartimento di Scienze Fisiche “E. R. Caianiello” and Istituto Nazionale di Fisica per la Materia, Universitá di Salerno, I-84081 Baronissi, Salerno, Italy

Sharon L. Sessions
Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403

Received 26 October 2000; published 11 April 2001

The quantum critical behavior of disordered itinerant ferromagnets is determined exactly by solving a recently developed effective field theory. It is shown that there are logarithmic corrections to a previous calculation of the critical behavior, and that the exact critical behavior coincides with that found earlier for a phase transition of undetermined nature in disordered interacting-electron systems. This confirms a previous suggestion that the unspecified transition should be identified with the ferromagnetic transition. The behavior of the conductivity, the tunneling density of states, and the phase and quasiparticle-relaxation rates across the ferromagnetic transition are also calculated.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.63.174428
DOI:
10.1103/PhysRevB.63.174428
PACS:
75.20.En, 75.10.Lp, 75.40.Cx, 75.40.Gb
 
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