強く酸化されたNb3GeのX.P.S.による組成分析〔英文〕

概要

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A new candidatite for superconductor is introduced as the results of our recent studies on the fabrication and properties of a strongly oxidized Nb_3Ge thin film prepared on a Al_2O_3-substrate. These experiments were triggered by our investigation to improve the reproducibility of the resistance anomaly of Nb-Si thin films reprorted earlier by us. The new films are confirmed to have resistance transition at a temperature of 44.5K along with a large diamagnetic transition. They also has good reproducibility and stability. A substantial amount of Al and O exisis in the film resulting in the formation of Nb_2O_5, GeO_2 and Al_2O_3 through strong oxidation. The chief characteristics of this transition are notably similar to superconductors with phonon-mediated electron-electron interaction. To explain the high T_c, however, we might have to consider another mechanism (i. e excitonic mechanism), which acknowledge the possibility of high-temperature carrier pairing.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文