Non-intrinsic superconductivity in InN epilayers: role of Indium Oxide
Abdul Kadir, Sourin Mukhopadhyay, Tapas Ganguli, Charudatta Galande,, M. R. Gokhale, B.M. Arora, Pratap Raychaudhuri, Arnab Bhattacharya
TL;DR
This study demonstrates that superconductivity observed in InN epilayers is due to oxygen impurities, not an intrinsic property of InN, by correlating electrical, magnetic, and structural data.
Contribution
The paper provides evidence that superconductivity in InN is caused by oxygen impurities, challenging previous claims of intrinsic superconductivity in InN.
Findings
Superconductivity correlates with oxygen impurity presence.
InN is not intrinsically superconducting.
Superconductivity is impurity-induced, not intrinsic.
Abstract
In recent years there have been reports of anomalous electrical resistivity and the presence of superconductivity in semiconducting InN layers. By a careful correlation of the temperature dependence of resistivity and magnetic susceptibility with structural information from highresolution x-ray diffraction measurements we show that superconductivity is not intrinsic to InN and is seen only in samples that show traces of oxygen impurity. We hence believe that InN is not intrinsically a superconducting semiconductor.
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