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Scanning Tunneling Spectroscopy on Pr0.68Pb0.32MnO3 single crystals

Rossler, S and Ernst, S and Padmanabhan, B and Elizabeth, Suja and Bhat, HL and Wirth, S and Steglich, F (2007) Scanning Tunneling Spectroscopy on Pr0.68Pb0.32MnO3 single crystals. In: 10th Joint Magnetism and Magnetic Materials Conference/International Magnetics Conference, Jan 07-11, 2007, Washington, DC, USA, 3064 -3066.

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Scanning tunneling microscopy/spectroscopy studies were carried out on single crystals of colossal magnetoresistive manganite Pr0. 68Pb0.32MnO3 at different temperatures in order to probe their spatial homogeneity across the metal-insulator transition temperature TM-I(similar to 255 K). A metallic behavior of the local conductance was observed for temperatures T < TM-I. Zero bias conductance (dI/dV)v=(0), which is directly proportional to the local surface density of states at the Fermi level, shows a single distribution at temperatures T < 200 K suggesting a homogeneous electronic phase at low temperatures. In a narrow temperature window of 200 K < T < TM-I, however, an inhomogeneous distribution of (dI/dV)v=(0) has been observed. This result gives evidence for phase separation in the transition region in this compound.

Item Type: Conference Paper
Publication: Magnetics, IEEE Transactions on
Publisher: IEEE
Additional Information: Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: doped manganites;magnetoresistance
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Apr 2010 07:47
Last Modified: 19 Sep 2010 06:00
URI: http://eprints.iisc.ac.in/id/eprint/27270

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