Magnetic-field and temperature dependence of the energy gap in InN nanobelt

We present tunneling measurements on an InN nanobelt which shows signatures of superconductivity. Superconducting transition takes place at temperature of 1.3K and the critical magnetic field is measured to be about 5.5kGs. The energy gap extrapolated to absolute temperature is about 110μeV. As the...

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Published inAIP advances Vol. 2; no. 1; pp. 012155 - 012155-6
Main Authors Aravind, K., Su, Y. W., Chung, D. S., Kuo, Watson, Wu, C. S., Chang-Liao, K. S., Chen, K. H., Chen, L. C., Chen, C. D.
Format Journal Article
LanguageEnglish
Published AIP Publishing LLC 01.03.2012
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Summary:We present tunneling measurements on an InN nanobelt which shows signatures of superconductivity. Superconducting transition takes place at temperature of 1.3K and the critical magnetic field is measured to be about 5.5kGs. The energy gap extrapolated to absolute temperature is about 110μeV. As the magnetic field is decreased to cross the critical magnetic field, the device shows a huge zero-bias magnetoresistance ratio of about 400%. This is attributed to the suppression of quasiparticle subgap tunneling in the presence of superconductivity. The measured magnetic-field and temperature dependence of the superconducting gap agree well with the reported dependences for conventional metallic superconductors.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.3691830