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Spin/Orbital Modulation in Perovskite Manganite Superlattices

Published online by Cambridge University Press:  10 February 2011


M. Izumi
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan
T. Manako
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan
M. Kawasaki
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan Department of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, Japan
Y. Tokura
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

Abstract

A systematic study is presented for structural characterization and physical properties of two kinds of perovskite oxide superlattices composed of ferromagnetic (FM) and antiferromagnetic (AF) layers. Spin ordering structures is modulated in FM La0.6Sr0.4MnO3/G-type AF La0.6Sr0.4FeO3 superlattices, whereas, ordering structures both in spin and orbital are modulated in La0.6Sr0.4MnO3/A-type AF La0.45Sr0.55MnO3 along the growth directions. Large magnetoresistance subsists down to low temperature in La0.6Sr0.4MnO3/La0.6Sr0.4 Fe3 (F/G) superlattices as a result of recovery of ferromagnetism, which is once suppressed by spin frustration at the interface between FM and G-type AF layers. In contrast, the constituent layers in the La0.6Sr0.4MnO3/La0.45Sr0.55MnO3 (F/A) superlattices appear to keep their ground states due to the absence of spin frustration at the interface. Magnetoresistance is pronounced in this type of superlattices at low temperatures when the AF layer is very thin, indicating restoration of the electronic coupling between the neighboring FM layers which are otherwise decoupled by intervening A-type AF spin ordering and d x 2y 2 orbital ordering in La0.45Sr0.55MnO3 layers.


Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

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