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Title: Spin dependent hopping and colossal negative magnetoresistance in epitaxial Nd0.52Sr0.48MnO3 films in fields up to 50 T
Authors: Wagner, P
Gordon, Ivan
Trappeniers, Lieven
Vanacken, Johan
Herlach, Fritz
Moshchalkov, Victor
Bruynseraede, Yvan #
Issue Date: Nov-1998
Publisher: American physical soc
Series Title: Physical review letters vol:81 issue:18 pages:3980-3983
Abstract: The low carrier mobility of the magnetic perovskite Nd0.52Sr0.48MnO3 implies that the dominant conductivity mechanism is related to Mott hopping. We propose a modification of Mott's original model by taking into account that the hopping barrier depends on the misorientation between the spins of electrons at an initial and a final state in an elementary hopping process. Using this model we deduce a negative-magnetoresistivity scaling proportional to the Brillouin function B in the ferromagnetic state and to B-2 in the paramagnetic state. Both predictions are in full agreement with the magnetoresistivity measured in pulsed magnetic fields up to 50 T. [S0031-9007(98)07410-9].
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
# (joint) last author

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