Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

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the ratio of Oxygen and Nb should be about 0.5, which means that there should be alayer of the mixture of Nb and NbO. Because the Nb 3 Sn cover the bulk Nb and havethe higher T c , there is some shielding effect during the temperature between 9.2K to17K. The shielding effect is different with the Nb sputtering current, but its ruler isnot clear.Fig. 3.38 the T c calculation of Nb 3 SnFig. 3.39 the T c calculation of NbThe possible structure of the sample could be like as the Fig. 3.36. Because theNbO has a large ratio and the Nb 3 Sn thin film deposited on the sapphire have no thethird transition temperature, it should not come from the Nb 3 Sn thin film, and the only62
source is the bulk Nb sample. Although the sample is preceded with BCP, the NbOcoming from the oxidation with the atmosphere for a long time can not be got rid ofwith a short time of 5 minute. So we need to test the more BCP time.All the other temperature transition curves are shown in Fig. 3.37. Among thesecurves, the best is the curve of 1A Nb sputtering current. The calculation method ofthe three critical temperatures is shown from Fig. 3.38 to Fig. 3.40.Fig. 3.40 the T c calculation of NbO xTc-NbOx[K]7.47.37.27.17.0Tc-Nb3Sn[K]17.817.617.417.217.016.816.6Tc-Nb3SnTc-NbTc-NbOx9.349.329.309.289.269.24Tc-Nb[K]6.916.49.226.816.21.0 1.2 1.4 1.6 1.8current[A]9.20Fig. 3.41 the Tc calculation result of the sample annealing with 5 minutes63
Page 1:
UNIVERSITÀ DEGLISTUDI DI PADOVAFac
Page 7 and 8:
IndexINDEX ........................
Page 9 and 10:
IntroductionThe superconductor acce
Page 11 and 12:
Fig. 1.1 Disc-loaded traveling-wave
Page 13 and 14:
In Type-II superconductors, vortex
Page 15 and 16:
needed for preventing the supercond
Page 17 and 18:
The B1 crystal structure has a cubi
Page 19 and 20: NbN cavities literature, is often h
Page 21 and 22: superconducting magnet construction
Page 23 and 24: 775°C. From the same diagram, it i
Page 25 and 26: two types of electrons at the Fermi
Page 27 and 28: Of course, there are some other kin
Page 29 and 30: as shown in Fig.2.3. The four opera
Page 31 and 32: Fig.2.8 turbomolecular pumpFig. 2.9
Page 33 and 34: Fig. 2.14 The chamber covered with
Page 35 and 36: Fig. 2.17 the gasket and the magnet
Page 37 and 38: shown in Fig. 2.21 and Fig. 2.22. T
Page 39 and 40: Fig. 2.26 The interface of the surf
Page 41 and 42: Fig. 2.30 put the sample into the T
Page 43 and 44: Fig. 2.34 the performance of the th
Page 45 and 46: 1008038.5°{110}69.6°{211}sample1s
Page 47 and 48: 2dsinθ= nλ (2.3)Fig.2.44 the diff
Page 49 and 50: Chapter 3 Multilayer deposition of
Page 51 and 52: 1 minute. The time of depositing mu
Page 53 and 54: chamber 1 and is connected to the s
Page 55 and 56: 3.2.2.2 Analysis resultⅠ The thic
Page 57 and 58: In order to detect the component of
Page 59 and 60: measure the RRR. So the resistance
Page 61 and 62: 110100903480relative Intensity70605
Page 63 and 64: frequency of the cavity which is in
Page 65 and 66: Fig. 3.28 the inductor coilDuring t
Page 67 and 68: Fig. 3.32 fixing the sample with Nb
Page 69: second transition temperature is th
Page 73 and 74: of 1A in the Fig. 3.37 and Fig. 3.4
Page 75 and 76: Table 3.10 the description of the p
Page 77 and 78: 1101001.0A10'-IND3 45 6 7 9 1011 12
Page 79 and 80: 1101009080341.8A10'INDrelative inte
Page 81 and 82: Reference1. A. Godeke, Nb3Sn FOR RA
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Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

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