Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film
Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film Magnetron sputtering of Superconducting Multilayer Nb3Sn Thin Film
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
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The B1 crystal structure has a cubic unit cell with two kinds <strong>of</strong> atom. It is bestthought <strong>of</strong> as a face-centered cubic array <strong>of</strong> 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 <strong>of</strong> the B1structure is that <strong>of</strong> NaCl.Fig. 1.3 The B1 crystal structureThe A15 crystal structure (also known as β-W or Cr 3 Si structure types) is series<strong>of</strong> 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 <strong>of</strong> these compoundshave superconductivity at around 20 K, which is comparatively high, and remainsuperconductive in magnetic fields <strong>of</strong> tens <strong>of</strong> teslas. This kind <strong>of</strong> superconductivity(Type-II superconductivity) is an important area <strong>of</strong> study as it has several practicalapplications.The first time <strong>of</strong> the A15 structure observed was in 1931 when an electrolyticallydeposited layer <strong>of</strong> tungsten was examined. [9] The discussion if the β–tungstenstructure is an allotrope <strong>of</strong> tungsten or the structure <strong>of</strong> 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 <strong>of</strong> tungsten. [10]9
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