Magnetic-history-dependent nanostructural and resistivity changes in Pr0.5Ca0.5Mn0.98Cr0.02O3
نویسنده
چکیده
We show that nanostructure and resistivity of Pr0.5Ca0.5Mn0.98Cr0.02O3 are sensitive to whether the sample is zero-field-cooled (ZFC) or field-cooled (FC) either in the ‘self-magnetic field (H ≈ 2 T)’ of the electron microscope or under the external magnetic field of 2 T. FC resistivity at H = 2 T is lower than ZFC values below 140 K. The average value of the charge-orbital modulation vector (q = 0.44) of the FC crystallites is lower than that of the ZFC crystallites (q = 0.48) and the FC crystallites exhibit numerous defects like discommensuration, dislocations and regions with loss of superstructures compared to the ZFC crystallites. PACS NO: 61.14.-x, 75.30.Vn, 75.60.Ee
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تاریخ انتشار 2000