期刊
JOURNAL OF APPLIED PHYSICS
卷 87, 期 9, 页码 5831-5833出版社
AMER INST PHYSICS
DOI: 10.1063/1.372537
关键词
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The ground state of La1-xCaxMnO3 changes from a ferromagnetic metallic to an antiferromagnetic charge-ordered state as a function of Ca concentration at x similar to 0.50. We present evidence from transport measurements on a sample with x=0.50 that the two phases can coexist, in agreement with other observations of phase separation in these materials. We also observe that, by applying and then removing a magnetic field to the mainly charge-ordered state at some temperatures, we can magnetically anneal the charge order, resulting in a higher zero-field resistivity. We also observe logarithmic time dependence in both resistivity and magnetization after a field sweep at low temperatures. (C) 2000 American Institute of Physics. [S0021- 8979(00)42808-2].
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