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    題名: Quasi-two-dimensional superconductivity in wurtzite-structured InN films
    作者: Ling, D. C.;Cheng, J. H.;Lo, Y. Y.;Du, C. H.;Chiu, A. P.;Chang, C. A.;Chang. P. H.
    貢獻者: 淡江大學物理學系
    日期: 2007-12
    上傳時間: 2013-07-09 15:05:18 (UTC+8)
    出版者: Weinheim: Wiley - VCH Verlag GmbH & Co. KGaA
    摘要: C-axis oriented InN films with wurtzite structure were grown on sapphire (0001) substrate by MOCVD method. Superconductivity with transition onset temperature Tc,onset around 3.5 K has been characterized by magnetotransport measurements in fields up to 9 Tesla for films with carrier concentration in the range of 1×1019 cm–3 to 7×1020 cm–3. Among them, the film with a nitridation buffer layer has the highest zero-resistance temperature Tc0 of 2 K. The normal-state magnetoresistance follows Kohler's rule ΔR /R ∝ (H /R)2, indicating that there is a single species of charge carrier with single scattering time at all points on the Fermi surface. The extrapolated value of zero-temperature upper critical field Hc 2ab (0) and Hc 2c (0) is estimated to be 5900 G and 2800 G, respectively, giving rise to the anisotropy parameter about 2.1. The angular dependence of the upper critical field is in good agreement with the behavior predicted by Lawrence-Doniach model in the two-dimensional (2D) limit strongly suggesting that the InN film is a quasi-2D superconductor. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
    關聯: Physica Status Solidi. B: Basic Research 244(12), pp.4594-4597
    DOI: 10.1002/pssb.200777396
    顯示於類別:[物理學系暨研究所] 期刊論文


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