Magnetic-history-dependent nanostructural and resistivity changes in Pr[sub 0.5]Ca[sub 0.5]Mn[sub 0.98]Cr[sub 0.02]O[sub 3]

Hervieu, M.; Mahendiran, R.; Maignan, A.; Martin, C.; Raveau, B.
November 2000
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
Academic Journal
We show that nanostructure and resistivity of Pr[sub 0.5]Ca[sub 0.5]Mn[sub 0.98]Cr[sub 0.02]O[sub 3] are sensitive to whether the sample is zero-field-cooled (ZFC) or field-cooled (FC) either in the "self-magnetic field (Happrox. 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. © 2000 American Institute of Physics.


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