Odd-gap spikes observed by tunneling spectroscopy for La-Sr-Cu-O single crystal

K. Nakajima*, T. Arai, S. E. Shafranjuk, T. Yamashita, I. Tanaka, H. Kojima

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The electron tunneling spectroscopy is performed on Pb-I-La1-xSrxCuO4 (LSCO) junctions fabricated on high quality LSCO single crystals grown by traveling solvent floating zone (TSFZ) method. For the junctions fabricated parallel to ab-planes, periodic sharp spikes in the spectrum are observed at ∼ 6 × (2n + 1) mV, where n is a natural number, while for the junctions fabricated on the (001) plane only gap structures corresponding to Pb and LSCO are observed. We ascribe the spike structure to subbands in the electron density of states caused by the Andreev reflections on the periodically modulated gap potential along the c-axis of LSCO.

Original languageEnglish (US)
Pages (from-to)292-295
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume293
Issue number1-4
DOIs
StatePublished - Dec 1997

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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