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Article: Anomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions

TitleAnomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions
Authors
KeywordsCondensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue Date2010
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpd
Citation
Journal of Physics D: Applied Physics, 2010, v. 43 n. 17, article no. 175003 How to Cite?
Abstract
The effect of a magnetic field on the current–voltage characteristics of Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions was studied. An abnormal increase in diffusion voltage, break down voltage and ideality factor was observed at a low temperature. It was also found that the transport properties of these heterojunctions could be considerably influenced by external magnetic fields. When a magnetic field was applied, I–V curves were shifted to a lower bias voltage. Both ideality factor and saturation current were affected by the magnetic field. The magnetic field modulation was more significant at lower temperatures. The analysis showed that the current–voltage relation was dominated by tunnelling. The anomaly at low temperatures may be a result of temperature and electric field dependence of the dielectric constant of Nb : SrTiO3. A magnetic field may also modify the work function and density of states of Pr0.6Ca0.4MnO3, leading to a change in current–voltage characteristics.
Persistent Identifierhttp://hdl.handle.net/10722/125284
ISSN
2013 Impact Factor: 2.521
ISI Accession Number ID
Funding AgencyGrant Number
Research Grant Council of Hong KongHKU 7025/06P
University of Hong Kong
Funding Information:

This work has been supported by the Research Grant Council of Hong Kong ( Project No HKU 7025/06P) and the Seed Funding of the University of Hong Kong.

Grants

 

Author Affiliations
  1. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorLuo, Zen_HK
dc.contributor.authorGao, Jen_HK
dc.date.accessioned2010-10-31T11:22:12Z-
dc.date.available2010-10-31T11:22:12Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal of Physics D: Applied Physics, 2010, v. 43 n. 17, article no. 175003en_HK
dc.identifier.issn0022-3727en_HK
dc.identifier.urihttp://hdl.handle.net/10722/125284-
dc.description.abstractThe effect of a magnetic field on the current–voltage characteristics of Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions was studied. An abnormal increase in diffusion voltage, break down voltage and ideality factor was observed at a low temperature. It was also found that the transport properties of these heterojunctions could be considerably influenced by external magnetic fields. When a magnetic field was applied, I–V curves were shifted to a lower bias voltage. Both ideality factor and saturation current were affected by the magnetic field. The magnetic field modulation was more significant at lower temperatures. The analysis showed that the current–voltage relation was dominated by tunnelling. The anomaly at low temperatures may be a result of temperature and electric field dependence of the dielectric constant of Nb : SrTiO3. A magnetic field may also modify the work function and density of states of Pr0.6Ca0.4MnO3, leading to a change in current–voltage characteristics.-
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpden_HK
dc.relation.ispartofJournal of Physics D: Applied Physicsen_HK
dc.rightsJournal of Physics D: Applied Physics. Copyright © Institute of Physics Publishing.-
dc.subjectCondensed matter: electrical, magnetic and optical-
dc.subjectSurfaces, interfaces and thin filmsen_HK
dc.titleAnomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctionsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-3727&volume=43&issue=17, article no. 175003&spage=&epage=&date=2010&atitle=Anomalous+temperature+and+magnetic+field+dependences+of+current–voltage+characteristics+in+Pr0.6Ca0.4MnO3/Nb-doped+SrTiO3+heterojunctionsen_HK
dc.identifier.emailGao, J: jugao@hku.hken_HK
dc.identifier.authorityGao, J=rp00699en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/0022-3727/43/17/175003-
dc.identifier.scopuseid_2-s2.0-77951090031-
dc.identifier.hkuros181539en_HK
dc.identifier.volume43en_HK
dc.identifier.issue17, article no. 175003-
dc.identifier.isiWOS:000276704200003-
dc.relation.projectOpto-electric response in heteroepitaxial junctions composed of transition metal perovskites-

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