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dc.contributor.authorCOEY, JOHN MICHAEL DAVID
dc.date.accessioned2009-08-12T17:13:59Z
dc.date.available2009-08-12T17:13:59Z
dc.date.issued1999
dc.date.submitted1999en
dc.identifier.citationB. Raquet, J.M.D. Coey, S. Wirth, S. von Molnar '1/f noise in the half-metallic oxides CrO2, Fe3O4, and La2/3Sr1/3MnO3' in Physical Review B - Condensed Matter and Materials Physics, 59, (19) 1999, pp 12435-12443en
dc.identifier.otherYen
dc.identifier.otherY
dc.identifier.urihttp://hdl.handle.net/2262/31737
dc.descriptionPUBLISHEDen
dc.description.abstractThe excess low-frequency (1/f) electrical noise of three representative half-metallic oxides, CrO2, Fe3O4, and La2/3Sr1/3MnO3, has been studied as a function of the temperature (5?300 K) and a magnetic field (up to 12 T). In CrO2 and La2/3Sr1/3MnO3, the resistance fluctuations are investigated in the metallic regime, below Tc. The magnetite noise is measured across the Verwey transition, in the hopping regime. We find, in all these oxides, a high normalized noise level which roughly follows the temperature dependence of the resistivity. For CrO2 and La2/3Sr1/3MnO3, the form of the density of state of the responsible excitations is inferred. Oxygen displacement around grain boundaries, magnetic fluctuations, and reversed-spin electronic excitations in the band structure are discussed as possible explanations of the low-frequency fluctuations. For Fe3O4, the 1/f noise and its temperature dependence are attributed to fluctuations of the number of carriers in a critical network.en
dc.description.sponsorshipThe authors would like to acknowledge the support of DARPA and the Office of Naval Research under Contract No. ONR-N00014-96-1-0767. One of the authors ~B.R.! also acknowledges A. Anane for stimulating discussions and the support of the National High Magnetic Field Laboratory. Another ~S.v.M.! wishes to express his gratitude to R. Koch for teaching him about noise and its measurement.en
dc.format.extent12435-12443en
dc.format.extent186389 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherAmerican Physical Societyen
dc.relation.ispartofseriesPhysical Review B - Condensed Matter and Materials Physicsen
dc.relation.ispartofseries59en
dc.relation.ispartofseries19en
dc.rightsYen
dc.subjectPhysicsen
dc.title1/f noise in the half-metallic oxides CrO2, Fe3O4, and La2/3Sr1/3MnO3en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jcoey


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