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Resistive Anomaly Relevant to Nd Moments in the Antiferromagnetic Phase of the Bandwidth-Controlled Manganites

Published online by Cambridge University Press:  18 March 2011

H. Kuwahara ,
K. Noda  and
R. Kawasaki
H. Kuwahara
Affiliation:
Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan PRESTO, Japan Science and Technology Corporation (JST), Tokyo, Japanh-kuwaha@sophia.ac.jp
K. Noda
Affiliation:
Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
R. Kawasaki
Affiliation:
Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
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Abstract

We have investigated the electronic and magnetic properties of (Nd1−ySmy)0.45Sr0.55MnO3(0≤y≤1) crystals, in which one-electron bandwidth (W ) is systematically decreased from the parent compound (y=0) with increase of y. We have found remarkable magnetic phase transition concerning the change of rare-earth (RE) moments in low temperatures below 25 K. The subtle drop in resistivity superimposed upon the spin-valve like magnetoresistance (MR) was observed for the isothermal MR measurements, e.g. δρ(H)|ρ(H')≍4.7% at 3.5 T and 4 K. The phase transition fields corresponding to these concomitant magnetic and resistive changes monotonically decrease with temperature and disappear above ∼25 K. It turned out that the resistive drop is due to the field-induced increase of magnetic moments ofRE ions from magnetization measurements. The field-induced phase transition from the small moment state to the large one in RE ions can be explained in terms of energy level crossing between the crystal-field-split J multiplets by the Zeeman effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG5.9
Copyright
Copyright © Materials Research Society 2001

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References

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