Suppression of structural and magnetotransport transitions in compressed Pr[sub 0.5]Sr[sub 0.5]MnO[sub 3] thin films resulting in colossal magnetoresistance effect

Mercey, B.; Hervieu, M.; Prellier, W.; Wolfman, J.; Simon, C.; Raveau, B.
June 2001
Applied Physics Letters;6/11/2001, Vol. 78 Issue 24, p3857
Academic Journal
Thin films of Pr[sub 0.5]Sr[sub 0.5]MnO[sub 3] have been deposited on [100]-LaAlO[sub 3] using laser ablation. In contrast to the bulk compounds, such films do not exhibit any structural and magnetotransport transitions versus temperature; more particularly the A-type antiferromagnetic phase with the Fmmm structure which exists in the bulk below T[sub N]=135 K is suppressed, and the film is an insulator in the absence of a magnetic field. However a colossal magnetoresistance effect is observed, with resistance ratios much larger than in the bulk. These differences with respect to the bulk, are explained by the presence of substrate-induced strains. © 2001 American Institute of Physics.


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