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Direct measurement of the charge ordering gap in Nd0.5Sr0.5MnO3 using vacuum tunnelling

Biswas, Amlan and Raychaudhuri, AK and Mahendiran, R and Guha, A and Mahesh, R and Rao, CNR (1997) Direct measurement of the charge ordering gap in Nd0.5Sr0.5MnO3 using vacuum tunnelling. In: Journal Of Physics-Condensed Matter, 9 (24). L355-L360.

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We have used tunnelling spectroscopy (TS) to probe the density of states (DOS) of the rare earth manganate Nd0.5Sr0.5MnO3, which shows a transition to a charge ordered (CO) antiferromagnetic insulating state from a ferromagnetic metallic state. We find that a gap opens up in the DOS around the Fermi level, E-F, as the solid is cooled below the charge ordering temperature T-CO. The charge ordering gap (Delta(CO)) was found to be strongly temperature dependent for T approximate to T-CO and for T/T-CO < 0.6 it reaches a limiting value of nearly 0.27 eV. Above T-CO the temperature dependence of the DOS at E-F was found to be similar to that of the solids such as La0.8Ca0.2MnO3 which show colossal magnetoresistance but no charge ordering.

Item Type: Journal Article
Publication: Journal Of Physics-Condensed Matter
Publisher: IOP Publishing
Additional Information: Copyright of this article belongs to IOP Publishing.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 20 Mar 2009 06:56
Last Modified: 19 Sep 2010 05:25
URI: http://eprints.iisc.ac.in/id/eprint/18863

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