標題: Phase separation and persistent magnetic memory effect in La0.625Ca0.375MnO3 and La0.375Pr0.25Ca0.375MnO3 films
作者: Tsai, Y. T.
Chang, W. J.
Hsieh, C. C.
Luo, C. W.
Wu, K. H.
Uen, T. M.
Juang, J. Y.
Lin, J. Y.
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 1-一月-2009
摘要: Both La0.375Pr0.25Ca0.375MnO3 (LPCMO) and La0.625Ca0.375MnO3 (LCMO) were found to exhibit coexistence of competing orders (phase separation) over a wide temperature range. However, substantial hysteretic behaviors in both of the temperature-dependent resistance [R(T)] and magnetization [M(T)] also known as the persistent magnetic memory effect (PMME)] are only displayed in LPCMO. The results indicate that, in LPCMO, the size distribution of the coexisting charge-ordered insulating and metallic ferromagnetic (FM) phases plays a determinant role in the PMME effects in different temperature regimes. Moreover, due to the direct competition between the two coexisting phases, the system is most susceptible to the external applied field in the hysteretic temperature region. On the other hand, in LCMO, the phase transition between paramagnetic and FM is more like an isomorphic transition in pure materials, and thus does not show significant hysteresis. c 2009 American Institute of Physics. [DOI: 10.1063/1.3055802]
URI: http://dx.doi.org/10.1063/1.3055802
http://hdl.handle.net/11536/149729
ISSN: 0021-8979
DOI: 10.1063/1.3055802
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 105
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