Affordable Access

Observation of superconductivity in granular bi nanowires fabricated by electrodeposition.

Authors
Type
Published Article
Journal
Nano letters
Publication Date
Volume
6
Issue
12
Pages
2773–2780
Identifiers
PMID: 17163704
Source
Medline
License
Unknown

Abstract

Bulk rhombohedral Bi at ambient pressure is a well-known semimetal, and its transition to a superconductor has not been observed, at least down to 50 mK. We report that, unlike bulk rhombohedral Bi, granular Bi nanowires with well-defined rhombohedral grains of approximately 10 nm diameter, fabricated by electrochemically depositing Bi into porous polycarbonate membranes at ambient pressure, are superconducting with two transition temperatures, Tc, of 7.2 and 8.3 K. These Tc values coincide with Tc values of the high-pressure phases Bi-III and Bi-V, respectively. Analysis of our structural and transport data indicates that the superconductivity in granular Bi nanowires probably arises from grain boundary areas where there are structural reconstructions between the grains showing a preferred orientation within a small angular distribution.

Statistics

Seen <100 times