Superconductivity of InN observed in the magnetoresistance at low temperature

We report on the superconductivity of n-type InN. There is an optimum carrier density for the occurrence of the superconductivity. The lowest carrier density is limited by the Mott transition of nc 2 × 1017 cm−3 and the highest density is limited by the superconductivity to metal transition of ni ∼...

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Bibliographic Details
Published in:Journal of physics. Conference series 2006-11, Vol.51 (1), p.279-282
Main Authors: Inushima, T, Kato, N, Takenobu, T, Motokawa, M, Higashiwaki, M, Matsui, T
Format: Article
Language:English
Subjects:
Carrier density
Chains
Low temperature
Magnetoresistance
Magnetoresistivity
Physics
Sapphire
Superconductivity
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Summary:We report on the superconductivity of n-type InN. There is an optimum carrier density for the occurrence of the superconductivity. The lowest carrier density is limited by the Mott transition of nc 2 × 1017 cm−3 and the highest density is limited by the superconductivity to metal transition of ni ∼ 7 × 1020cm−3. We propose a mechanism where the occurrence of the superconductivity is related to the presence of In-In chains of finite lengths in the ab plane. The In-In chains, which originate from the inversion domains of InN grown on sapphire (0001) and elongate along [11 0], are coupled to form micro Josephson-junctions.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/51/1/064