Thermally assisted tunneling transport in La0.7Ca0.3MnO3/SrTiO3:Nb Schottky-like heterojunctions

Cuellar Giménez, Fabián and Sánchez Santolino, Gabriel and Varela, M. and Clement Lorenzo, Marta and Iborra Grau, Enrique and Sefrioui, Zouhair and Santamaría Sánchez-Barriga, Jacobo and León Yebra, Carlos (2012). Thermally assisted tunneling transport in La0.7Ca0.3MnO3/SrTiO3:Nb Schottky-like heterojunctions. "Physical Review B", v. 85 ; pp. 2451221-2451226. ISSN 1098-0121. https://doi.org/10.1103/PhysRevB.85.245122.

Description

Title: Thermally assisted tunneling transport in La0.7Ca0.3MnO3/SrTiO3:Nb Schottky-like heterojunctions
Author/s:
  • Cuellar Giménez, Fabián
  • Sánchez Santolino, Gabriel
  • Varela, M.
  • Clement Lorenzo, Marta
  • Iborra Grau, Enrique
  • Sefrioui, Zouhair
  • Santamaría Sánchez-Barriga, Jacobo
  • León Yebra, Carlos
Item Type: Article
Título de Revista/Publicación: Physical Review B
Date: 20 July 2012
ISSN: 1098-0121
Volume: 85
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Electrónica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

We report on the electrical transport properties of all-oxide La0.7Ca0.3MnO3/SrTiO3:Nb heterojunctions with lateral size of just a few micrometers. The use of lithography techniques to pattern manganite pillars ensures perpendicular transport and allows exploration of the microscopic conduction mechanism through the interface. From the analysis of the current-voltage characteristics in the temperature range 20-280 K we find a Schottky-like behavior that can be described by a mechanism of thermally assisted tunneling if a temperature-dependent value of the dielectric permittivity of SrTiO3:Nb (NSTO) is considered.We determine the Schottky energy barrier at the interface, qVB = 1.10 ± 0.02 eV, which is found to be temperature independent, and a value of ? = 17 ± 2 meV for the energy of the Fermi level in NSTO with respect to the bottom of its conduction band.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7239739STEMOXUnspecifiedUnder the light of electrons

More information

Item ID: 15688
DC Identifier: http://oa.upm.es/15688/
OAI Identifier: oai:oa.upm.es:15688
DOI: 10.1103/PhysRevB.85.245122
Official URL: http://prb.aps.org/abstract/PRB/v85/i24/e245122
Deposited by: Memoria Investigacion
Deposited on: 11 Jun 2013 19:33
Last Modified: 20 Oct 2014 15:54
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