Experimental determination of superconducting parameters for the intermetallic perovskite superconductor (formula presented)

Z. Q. Mao, M. M. Rosario, K. D. Nelson, K. Wu, I. G. Deac, P. Schiffer, Y. Liu, T. He, K. A. Regan, R. J. Cava

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We have measured upper-critical-field (formula presented) specific heat C, and tunneling spectra of the intermetallic perovskite superconductor (formula presented) with a superconducting transition temperature (formula presented) Based on these measurements and relevant theoretical relations, we have evaluated various superconducting parameters for this material, including the thermodynamic critical field (formula presented) coherence length (formula presented) penetration depth (formula presented) lower-critical-field (formula presented) and Ginzburg-Landau parameter (formula presented) From the specific heat, we obtain the Debye temperature (formula presented) We find a jump of (formula presented) at (formula presented) (where (formula presented) is the normal-state electronic specific coefficient), which is larger than the weak-coupling BCS value of 1.43, suggesting that (formula presented) may be a strong-coupling superconductor. In addition, we observed a pronounced zero-bias conductance peak (ZBCP) in the tunneling spectra. We discuss the possible physical origins of the observed ZBCP.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number9
DOIs
StatePublished - Mar 13 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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