Mesoscopic effect observed in strong correlated electron materials

H. Kashiwaya, A. Sawa, S. Kashiwaya, I. Kurosawa, H. Tsuchiura, Y. Tanaka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The conductance spectra in YBa2Cu3O7-δ/La0.67Sr0.33 MnO3 (YBCO/LSMO) tunnel junctions are studied in ultra-low-temperature region in order to clarify the influences of strong correlation on transport. The conductance spectra vary from usual Blonder-Tinkham-Klapwijk type to phase coherent transport as the junction size becomes smaller. Conductance spectra obtained on small junctions (less than 15 × 15 μm2) show a periodic response to the applied magnetic field, which suggests the presence of the Aharanov-Bohm effect in the LSMO electrode. From these features, we conclude that the mesoscopic effect due to phase coherency of conducting electrons survives even in the strongly correlated electron system. Estimated phase coherence length lφ of LSMO is between 0.19 and 9 μm at 150 mK.

Original languageEnglish
Pages (from-to)364-367
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - 2002 Oct 1
Externally publishedYes

Keywords

  • Mesoscopic effect
  • Phase coherent transport
  • YBCO
  • Zero-bias anomaly

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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