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Thermopower and nature of the hole-doped states in LaMnO3 and related systems showing giant magnetoresistance

Mahendiran, R and Tiwary, SK and Raychaudhuri, AK (1996) Thermopower and nature of the hole-doped states in LaMnO3 and related systems showing giant magnetoresistance. In: Physical Review B, 54 (14). R9604-R9607.

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Official URL: http://prola.aps.org/abstract/PRB/v54/i14/pR9604_1

Abstract

We have measured the thermopower (S) of hole-doped LaMnO3 systems in order to see its dependence on the Mn4+ content as well as to investigate other crucial factors that determine S. We have carried out hole doping (creation of Mn4+ by two distinct means, namely, by the substitution of La by divalent cations such as Ca and Sr and by self-doping without aliovalent substitution). The thermopower is sensitive not only to the hole concentration but also to the process employed for hole doping, which we explain as arising from the differences in the nature of the hole-doped states. We also point out a general trend in the dependence of S on hole concentration at high temperatures (T> T-c), similar to that found in the normal-state thermopower of the cuprates.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 08 Dec 2009 10:55
Last Modified: 13 Apr 2011 05:17
URI: http://eprints.iisc.ernet.in/id/eprint/19380

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