Title:
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Magnetic fingerprints of the very fast jumps of colossal magnetoresistance in the phase-separated manganite La0.225Pr0.40Ca0.375MnO3
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Author:
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Macià Bros, Ferran; Abril, Guillem; Hernández Mínguez, Alberto; Hernández Ferràs, Joan Manel; Tejada Palacios, Javier; Parisi, F.
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Other authors:
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Universitat de Barcelona |
Abstract:
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We found that colossal variations of resistance in
La
0.225
Pr
0.40
Ca
0.375
Mn
O
3
in about
100
μ
s
occur simultaneously with magnetic avalanches that last about
1
ms
. These findings are interpreted as macroscopic fingerprints of the percolative phase separation upon application of the external magnetic field. Depending on the fraction of the ferromagnetic phase
x
, the colossal magnetoresistance jumps appear to be caused either by fluctuations of
x
, accompanied by fast propagation of the magnetic avalanches through the sample, or by a phase transition from charge ordered antiferromagnetic phase to charge delocalized ferromagnetic phase. |
Subject(s):
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-Materials magnètics -Propietats magnètiques -Magnetic materials -Magnetic properties |
Rights:
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(c) The American Physical Society, 2008
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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