Title: Electronic and magnetic instability in Pr0.65Ca0.25Sr0.1MnO3
Authors: Mollah, S
Huang, HL
Liu, SJ
Ho, PL
Huang, WL
Huang, CW
Sun, CP
Lin, JY
Gou, YS
Li, WH
Yang, HD
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
Keywords: manganites;CMR;phase instability
Issue Date: 1-Sep-2003
Abstract: Electronic and magnetic instability in polycrystalline Pr0.65Ca0.25Sr0.1MnO3 manganite has been established from a systematic study of resistivity (p), magnetization (M) and specific heat (C). The sample shows a charge ordering transition at T-CO similar to 200 K, an antiferromagnetic (AFM) ordering transition at T-N similar to 175 K, a metal-insulator (MI) transition at T-MI similar to 80 K and an unusual magnetic ordering transition at T-M(*) similar to 45 K in the absence of magnetic fields. Though the C data do not show any anomaly at T-MI for MI transition, these illustrate a much smaller anomaly than expected one at T-M* and is suppressed by magnetic fields. This indicates that the unusual magnetic ordering in this sample is of canted, fluctuated or phase separation of AFM and ferromagnetic in nature which is established from the T-H phase diagram, as well as the thermal and magnetic hysteresis in p, M and C. (C) 2003 Elsevier Science B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/S0304-8853(03)00268-3
http://hdl.handle.net/11536/27559
ISSN: 0304-8853
DOI: 10.1016/S0304-8853(03)00268-3
Journal: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume: 265
Issue: 2
Begin Page: 215
End Page: 221
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