Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film
Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film
transition temperatures are found during the measurement as shown in Fig. 3.34.Fig. 3.34 three transition temperature of the T c curveFig. 3.35 Electrical resistivity and superconducting critical temperature as a functionof composition; as-cast alloys of niobium and oxygen.It is no doubt that the first transition temperature is the T c of Nb 3 Sn and the60
second transition temperature is the T c of Nb. The third transition temperature isimpossible to be the T c of Nb 5 Sn 6 or NbSn 2 , because the Tc of them is no more than3K [32] . Also, according to the Fig. 3.37 and Fig.3.41, the third transition temperatureis almost invariable with the changing of the Nb sputtering current, which means thatthe third transition temperature is also impossible to be the T c of the mixture of theNb 5 Sn 6, NbSn 2 and Nb, because if there is the mixture, the T c should be change withthe different composition of them.Fig. 3.36 the possible structure of the samplerelative intensity1.11.00.90.80.70.60.50.40.30.21A1.2A1.4A1.6A1.8A0.10.0-0.14 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19temperature[K]Fig. 3.37 the transition temperature curve of the sample annealed with 5 minutesAccording to the Fig. 3.35 [33] , the third transition temperature should be the T c ofNbO x . When the ratio of Oxygen and Nb is greater than 1.0, the T c should be about1.38K. According to the third transition temperature of 7.2K given by the experiment,61
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transition temperatures are found during the measurement as shown in Fig. 3.34.Fig. 3.34 three transition temperature <strong>of</strong> the T c curveFig. 3.35 Electrical resistivity and superconducting critical temperature as a function<strong>of</strong> composition; as-cast alloys <strong>of</strong> niobium and oxygen.It is no doubt that the first transition temperature is the T c <strong>of</strong> Nb 3 Sn and the60
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