Observation of granularity in YNi2B2C superconductors containing normal impurity phases

E. Bar-Sadeh*, I. Felner, U. Asaf, O. Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Cryogenic scanning tunneling microscopy is used to study the local electronic properties of intermetallic YNi2B2C superconductors. Samples which were prepared with Ni deficiency showed a sharp superconducting transition, onset around 15 K, while x-ray-diffraction measurements clearly indicated a presence of a nonsuperconducting YB2C2 phase. Our scanning tunneling spectroscopy measurements on these samples show strong spatial variations of the tunneling conductance, consistent with granular materials. In particular, we observe reproducible transitions between normal regions to superconducting regions, having a gap parameter of 2.55±V at 4.2 K, on length scales of 20 nm. In addition, the I-V characteristics often manifest single-electron tunneling effects, also typical of granular systems.

Original languageAmerican English
Pages (from-to)6734-6738
Number of pages5
JournalPhysical Review B
Volume52
Issue number9
DOIs
StatePublished - 1995

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