Spin blockade effects in chromium oxide intergrain magnetoresistance

CrO 2 thin films with crystallites of a significant size permit investigation of the thin intergrain conduction between a limited numbers of crystals. Phoemission techniques reveal that the CrO2 films are covered by a 1–2-nm-thick Cr2O3 insulating barrier. The electronic band gap of the surface elec...

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Bibliographic Details
Published in:Journal of applied physics 2002-05, Vol.91 (10), p.8801-8803
Main Authors: Sokolov, A., Yang, C.-S., Yuan, L., Liou, S.-H., Cheng, Ruihua, Xu, B., Borca, C. N., Dowben, P. A., Doudin, B.
Format: Article
Language:English
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Summary:CrO 2 thin films with crystallites of a significant size permit investigation of the thin intergrain conduction between a limited numbers of crystals. Phoemission techniques reveal that the CrO2 films are covered by a 1–2-nm-thick Cr2O3 insulating barrier. The electronic band gap of the surface electrons is 3.4 eV at low temperatures, decreases sharply down to 2.8 eV at ambient. Electric transport though a few junctions in series shows a remarkable zero-bias anomaly, interpreted in terms of blockade effects. We show that the magnetoresistance is governed by low-bias blockade in these junctions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1452240