Scaling Theory of Magnetoresistance in Disordered Local Moment Ferromagnets

Gergely Zaránd, Cătălin Paşcu Moca, and Boldizsár Jankó
Phys. Rev. Lett. 94, 247202 – Published 21 June 2005

Abstract

We present a scaling theory of magnetotransport in Anderson-localized disordered ferromagnets. Within our framework a pronounced magnetic-field-sensitive resistance peak emerges naturally for temperatures near the magnetic phase transition. We find that the resistance anomaly is a direct consequence of the change in localization length caused by the magnetic transition. For increasing values of the external magnetic field, the resistance peak is gradually depleted and pushed towards higher temperatures. Our results are in good agreement with magnetoresistance measurements on a variety of disorder magnets.

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  • Received 16 November 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.247202

©2005 American Physical Society

Authors & Affiliations

Gergely Zaránd1, Cătălin Paşcu Moca2, and Boldizsár Jankó3,4

  • 1Budapest University of Technology and Economics, H-1521 Budapest, Hungary
  • 2Department of Physics, University of Oradea, 410087 Oradea, Romania
  • 3Department of Physics and Institute for Theoretical Sciences, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 4Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA

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Issue

Vol. 94, Iss. 24 — 24 June 2005

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