Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

More documents

Recommendations

Info

5*10 -3 mbar and the red point means 3*10 -3 mbar. From the picture, we can see that thehighest cubic edge length is that of 1.2 A sputtering current.0.33200.33150.3310cubic edge length (nm)0.33050.33000.32950.32905E-3mbar3E-3mbartheory0.32850.32800.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5current (A)Fig. 2.45 the cubic edge length versus sputtering current2.3 DiscussionSample analysis of sputtered niobium films is the primary step for the Nb 3 Snmultilayer thin film deposition. Film crystalline structure, thickness, T c and RRR areimportant diagnosis of the sputter deposition. The further investigation is needed.40
Chapter 3 Multilayer deposition of Nb 3 Sn3.1 Technique of depositionFig. 3.1 the structure of multilayerMultilayer deposition can improve the H c of superconductor. However, we usethe multilayer to produce the A15 crystal structure of Nb 3 Sn. If the thin film is madeof multilayer as shown in Fig. 3.1, when we heat the thin film, the Sn atom and the Nbatom move little distance and the A15 Nb 3 Sn crystal is easy to be obtained. In order toimprove the adherence of the thin film, the Nb buffer layer is first deposited. Becausethe vapour pressure of Sn is very low, the Nb over layer is needed to prevent the Snvaporizing.Fig. 3.2 Sketch of the UHV multilayer deposition systemFor the deposition of the multilayer in the cylindrical stainless steel vacuum41
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: 2dsinθ= nλ (2.3)Fig.2.44 the diff
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 and 70: second transition temperature is th
Page 71 and 72: source is the bulk Nb sample. Altho
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

Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

Create successful ePaper yourself

Delete template?

Save as template?