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Phase Separation at Interfaces in La2/3Ca1/3MnO3 Thin Films

Published online by Cambridge University Press:  17 March 2011

J. Fontcuberta ,
M. Bibes ,
M. Wojcik ,
E. Jedryka ,
S. Nadolski ,
S. València ,
Ll. Balcells  and
B. Martínez
J. Fontcuberta
Affiliation:
Institut de Ciència de Materials de Barcelona. Campus UAB, Bellaterra 08193. Catalunya., Spain
M. Bibes
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
M. Wojcik
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
E. Jedryka
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
S. Nadolski
Affiliation:
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
S. València
Affiliation:
Institut de Ciència de Materials de Barcelona. Campus UAB, Bellaterra 08193. Catalunya., Spain
Ll. Balcells
Affiliation:
Institut de Ciència de Materials de Barcelona. Campus UAB, Bellaterra 08193. Catalunya., Spain
B. Martínez
Affiliation:
Institut de Ciència de Materials de Barcelona. Campus UAB, Bellaterra 08193. Catalunya., Spain
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Abstract

We present an extensive physical characterization of La2/3Ca1/3MnO3 (LCMO) epitaxial films grown on SrTiO3 (STO), LaAlO3 (LAO) and NdGaO3 (NGO) substrates. The main difference among these substrates is that they have a different mismatch (∼ 1.2%, -1.8% and - 0.1%, respectively) with the manganite. The films can be coherently grown up to 180 nm for STO and NGO but partial relaxation is observed for LAO. The magnetotransport data indicate that very thin films (<27nm) display non-conventional magnetoresistive properties: a substantial magnetoresistance develops which can be progressively appreciated for STO and LAO films. 55Mn-Nuclear Magnetic Resonance experiments on all these films reveal the presence of non-homogeneous electronic states. These experiments in fact provide clear evidence of the presence of two distinguishable ferromagnetic Mn states and a non-ferromagnetic phase. The possible role of strain-induced charge localization is discussed. It turns out that electronic phase separation occurs in all films irrespectively of the particular substrate used; thus we conclude that strain is not the unique driving force for charge localization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 690: Symposium F – Spintronics , 2001 , F4.1
Copyright
Copyright © Materials Research Society 2002

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References

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