Origin of an enhanced colossal magnetoresistance effect in epitaxial Nd(0.52)Sr(0.48)MnO(3) thin films

Journal article (2011)

Authors

VG Prokhorov External organisation
GG Kaminsky External organisation
JM Kim External organisation
TW Eom External organisation
JS Park External organisation
YP Lee External organisation
GG Levtchenko External organisation
YM Nikolaenko External organisation
VA Khokhlov External organisation
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Published Date

2011

Language

English

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Abstract

Nd(0.52)Sr(0.48)MnO(3) films of various thicknesses have been prepared by dc magnetron sputtering on single crystal LaAlO(3) (001) substrates. Reducing the film thickness leads to a significant suppression of ferromagnetic (FM) ordering and the Curie point falls below the antiferromagnetic (AFM) transition temperature. When this occurs, a huge rise of the magnetoresistance ratio from 400 to 60 000% is observed in an applied magnetic field of 5 T. We surmise that this new kind of the enhanced colossal magnetoresistance effect originates in the FM/AFM competition and the collapse of the charge-ordered state at high magnetic fields, rather than in the regular double-exchange mechanism.