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Article: Anomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions
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TitleAnomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions
 
AuthorsLuo, Z1
Gao, J1
 
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
 
CitationJournal of Physics D: Applied Physics, 2010, v. 43 n. 17, article no. 175003 [How to Cite?]
DOI: http://dx.doi.org/10.1088/0022-3727/43/17/175003
 
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.
 
ISSN0022-3727
2012 Impact Factor: 2.528
2012 SCImago Journal Rankings: 0.941
 
DOIhttp://dx.doi.org/10.1088/0022-3727/43/17/175003
 
ISI Accession Number IDWOS:000276704200003
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.

 
GrantsOpto-electric response in heteroepitaxial junctions composed of transition metal perovskites
 
DC FieldValue
dc.contributor.authorLuo, Z
 
dc.contributor.authorGao, J
 
dc.date.accessioned2010-10-31T11:22:12Z
 
dc.date.available2010-10-31T11:22:12Z
 
dc.date.issued2010
 
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.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationJournal of Physics D: Applied Physics, 2010, v. 43 n. 17, article no. 175003 [How to Cite?]
DOI: http://dx.doi.org/10.1088/0022-3727/43/17/175003
 
dc.identifier.doihttp://dx.doi.org/10.1088/0022-3727/43/17/175003
 
dc.identifier.hkuros181539
 
dc.identifier.isiWOS:000276704200003
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.

 
dc.identifier.issn0022-3727
2012 Impact Factor: 2.528
2012 SCImago Journal Rankings: 0.941
 
dc.identifier.issue17, article no. 175003
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-77951090031
 
dc.identifier.urihttp://hdl.handle.net/10722/125284
 
dc.identifier.volume43
 
dc.languageeng
 
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/Journals/jpd
 
dc.relation.ispartofJournal of Physics D: Applied Physics
 
dc.relation.projectOpto-electric response in heteroepitaxial junctions composed of transition metal perovskites
 
dc.rightsJournal of Physics D: Applied Physics. Copyright © Institute of Physics Publishing.
 
dc.subjectCondensed matter: electrical, magnetic and optical
 
dc.subjectSurfaces, interfaces and thin films
 
dc.titleAnomalous temperature and magnetic field dependences of current–voltage characteristics in Pr0.6Ca0.4MnO3/Nb-doped SrTiO3 heterojunctions
 
dc.typeArticle
 
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<date.issued>2010</date.issued>
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<description.abstract>The effect of a magnetic field on the current&#8211;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&#8211;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&#8211;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&#8211;voltage characteristics.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong