corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 101 » Issue 3
< Previous Article | Next Article >

Phys. Rev. Lett. 101, 037002 (2008) [4 pages]

Scanning Josephson Tunneling Microscopy of Single-Crystal Bi2Sr2CaCu2O8+δ with a Conventional Superconducting Tip

Download: PDF (449 kB) Buy this article Export: BibTeX or EndNote (RIS)

Hikari Kimura1,2, R. P. Barber, Jr.3, S. Ono4, Yoichi Ando5, and R. C. Dynes1,2,*
1Department of Physics, University of California, Berkeley, California 94720, USA
2Materials Sciences Division, Lawrence Berkeley National Lab., Berkeley, California 94720, USA
3Department of Physics, Santa Clara University, Santa Clara, California 95053, USA
4Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan
5The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan

Received 15 April 2008; revised 26 May 2008; published 18 July 2008

We have performed both Josephson and quasiparticle tunneling in vacuum tunnel junctions formed between a conventional superconducting scanning tunneling microscope tip and overdoped Bi2Sr2CaCu2O8+δ single crystals. A Josephson current is observed with a peak centered at a small finite voltage due to the thermal-fluctuation-dominated superconducting phase dynamics. Josephson measurements at different surface locations yield local values for the Josephson ICRN product. Corresponding energy gap measurements were also performed and a surprising inverse correlation was observed between the local ICRN product and the local energy gap.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.037002
DOI:
10.1103/PhysRevLett.101.037002
PACS:
74.40.+k, 74.25.Dw, 74.50.+r, 74.72.Hs

*rdynes@physics.berkeley.edu

 
< Previous Article | Next Article >