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Magneto-Transport Properties in Layered Manganite Crystals

Published online by Cambridge University Press:  10 February 2011

T. Kimura
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
Y. Tomioka
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
T. Okudat
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
H. Kuwahara
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
A. Asamitsu
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
Y. Tokura
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan Department of Applied Physics, University of Tokyo, Tokyo 113, Japan
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Abstract

Anisotropie charge transport and magnetic properties have been investigated for single crystals of the layered manganite, La2–2xMn2O7 (0.3≤x≤0.5). Remarkable variations in the magnetic structure as well as in the charge-transport properties are observed with changing doping-level x. A crystal with x=0.3 behaves like a 2-dimensional ferromagnetic metal in the temperature region between ∼90 K and ∼270 K, and shows the interplane tunneling magnetoresistance at lower temperatures. These characteristic charge-transport properties are attributed to the interplane magnetic coupling between the adjacent MnO2 bilayers, and are strongly affected by the application of pressure as well as low magnetic fields through the change in magnetic structure. With increase of the carrier concentration toward x=0.5, the charge-ordered phase is stabilized and dominates the charge transport and magnetic properties.

Type
Research Article
Copyright
Copyright © Materials Research Society 1998

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References

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