Quasi-two-dimensional superconductivity in wurtzite-structured InN films
學年 96
學期 1
出版(發表)日期 2007-12-01
作品名稱 Quasi-two-dimensional superconductivity in wurtzite-structured InN films
著者 Ling, D. C.; Cheng, J. H.;Lo, Y. Y. ; Du, C. H.; Chiu, A. P.; Chang, C. A.; Chang. P. H.
單位 淡江大學物理學系
出版者 Weinheim: Wiley - VCH Verlag GmbH & Co. KGaA
著錄名稱、卷期、頁數 Physica Status Solidi. B: Basic Research 244(12), pp.4594-4597
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)
語言 en
ISSN 0370-1972
期刊性質 國外
收錄於 SCI
國別 DEU
出版型式 紙本

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