Zero-bias anomaly in CrO2 junctions

A. Sokolov, C. S. Yang, L. Yuan, Sy-Hwang Liou, Ruihua Cheng, H. K. Jeong, T. Komesu, B. Xu, C. N. Borca, P. A. Dowben, B. Doudin

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Abstract

CrO2 thin films, with crystallites of several microns size, provide the opportunity for the investigation of the intergrain tunneling between a few crystals separated by a 1-2 nm thick Cr2O3 film. A pronounced zero-bias anomaly of the conductance is found at low temperatures. Combined photoemission and inverse photoemission temperature-dependent studies confirm the occurrence of Coulomb blockade. For the strong-tunneling case (R ≪ RQ = h/2e2), the magnetoresistance decreases strongly with bias. For the weak-tunneling case (R ≫ RQ), the magnetoresistance decreases by a factor two with increasing bias, as predicted by a co-tunneling model.

Original languageEnglish (US)
Pages (from-to)448-454
Number of pages7
JournalEurophysics Letters
Volume58
Issue number3
DOIs
Publication statusPublished - Aug 19 2002

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sokolov, A., Yang, C. S., Yuan, L., Liou, S-H., Cheng, R., Jeong, H. K., ... Doudin, B. (2002). Zero-bias anomaly in CrO2 junctions. Europhysics Letters, 58(3), 448-454. https://doi.org/10.1209/epl/i2002-00659-y