2002
DOI: 10.1088/0022-3727/35/19/322
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Half-metallic oxide point contacts

Abstract: A classification of half-metals is illustrated with examples of ferromagnetic and ferrimagnetic oxides. I : V characteristics and magnetoresistance of contacts between oxides with localized electrons (Fe3O4) and delocalized electrons ((La0.7Sr0.3)MnO3) are discussed. The magnetoresistance is large when the conductance of the contact is less than the quantum of conductance G0 = 2e2/h. Broad distributions of point contacts are investigated in pressed powder compacts, illustrated by powder magnetoresistance measu… Show more

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Cited by 37 publications
(30 citation statements)
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“…In this case only the minority-spin 3d 1 bands would conduct so that, according to the proposed classification in Ref. 22, it would be of type I B .…”
mentioning
confidence: 99%
“…In this case only the minority-spin 3d 1 bands would conduct so that, according to the proposed classification in Ref. 22, it would be of type I B .…”
mentioning
confidence: 99%
“…The difference in conduction process is evident in break junctions, where a series of conduction plateaus is observed for the metallic conductors, but not in magnetite where a histogram plot of resistivity shows a single weak peak at G 0 . 10 The critical hop in a point contact across the interface from one surface to the next will be influenced by surface phonons as well as by an ill-defined adsorbed surface layer.…”
Section: Discussionmentioning
confidence: 99%
“…2. Some of the data for Fe 3 O 4 , 9 ͑La 0.7 Sr 0.3 ͒MnO 3 , 10 and MnBi 11 have been reported previously, and a summary of the earlier work was published. 10 The reproducible I : V curves are fitted to the expression…”
Section: A Point Contactsmentioning
confidence: 93%
“…According to the general classification [6], when the ↑ carriers are itinerant and the ↓ carriers are localized (or visa versa), we have transport half-metal, classified as a type III A (or III B ) half-metal. (The suffix A or B indicates whether the conduction electrons are ↑ or ↓ with respect to magnetization direction.)…”
Section: Ferromagnetic Half-metallic Manganitesmentioning
confidence: 99%
“…Methods available to measure spin polarization include spin-polarized photoemission [5], and transport measurements in point contacts and tunnel junctions with two ferromagnetic electrodes (see, e.g., [6]), or with ferromagnetic and superconducting electrodes. The latter case splits into two spectroscopic methods: the tunneling spectroscopy, originated in Tedrow-Meservey works on probing spin polarization [7], and the point-contact (PC) Andreev-reflection (AR) spectroscopy based on the way of supercurrent conversion into quasiparticle current at superconductor (SC)-normal metal (N) interface invented by Andreev [8].…”
Section: Introductionmentioning
confidence: 99%