Temperature-dependent vacuum tunneling spectroscopy of rare- earth manganates showing colossal magnetoresistance and charge ordering

Biswas, A and Raychaudhuri, AK and Arulraj, A and Rao, CNR (1998) Temperature-dependent vacuum tunneling spectroscopy of rare- earth manganates showing colossal magnetoresistance and charge ordering. In: Applied Physics A: Materials Science & Processing, 66 (7). S1213-S1216.

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Abstract

We report here the results of vacuum tunneling spectroscopy of race-earth manganates which show colossal magnetoresistance (CMR) and charge ordering (CO). Three samples with different hole concentrations and average A site cation radii have been studied. A charge-ordering gap (Delta(CO)) opens up in the density of states (DOS) near E-F, below the charge-ordering transition. A gap comparable to the transport gap opens up in the paramagnetic state also. There is an absence of gap only in the ferromagnetic metallic state. We have measured the temperature dependence of these quantities.

Item Type:	Journal Article
Publication:	Applied Physics A: Materials Science & Processing
Publisher:	Springer-Verlag
Additional Information:	Copyright for this article belongs to Springer-Verlag.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Sep 2004
Last Modified:	19 Sep 2010 04:15
URI:	http://eprints.iisc.ac.in/id/eprint/1394

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