Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

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10K as shown in Table 1.2 and Table 1.3 [8] , and there is some possibility of operatingat the temperature of 4.2K.Table 1.2 Critical Temperature of compounds with B1 structureTable 1.3 Critical temperature of binaryA15 compounds8
The B1 crystal structure has a cubic unit cell with two kinds of atom. It is bestthought of as a face-centered cubic array of anions with an interpenetrating fcc cationlattice (or vice-versa) so as to form a 3D checkerboard pattern as shown in Fig. 1.3.The cell looks the same whether you start with anions or cations on the corners. Eachion is 6-coordinate and has a local octahedral geometry. The most common of the B1structure is that of NaCl.Fig. 1.3 The B1 crystal structureThe A15 crystal structure (also known as β-W or Cr 3 Si structure types) is seriesof intermetallic compounds with the chemical formula A 3 B (where A is a transitionmetal and B can be any element) and a specific structure. Many of these compoundshave superconductivity at around 20 K, which is comparatively high, and remainsuperconductive in magnetic fields of tens of teslas. This kind of superconductivity(Type-II superconductivity) is an important area of study as it has several practicalapplications.The first time of the A15 structure observed was in 1931 when an electrolyticallydeposited layer of tungsten was examined. [9] The discussion if the β–tungstenstructure is an allotrope of tungsten or the structure of a tungsten suboxide waslong-standing and in 1998 the articles about the discussion were still published. In theend it seems most likely that the material is a true allotrope of tungsten. [10]9
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: needed for preventing the supercond
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 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
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Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film

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