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Intralattice Strain Analysis in Superconducting Crystals and Superconducting Electrons
Author(s) -
Fukuhara M.,
McKinstry H. A.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221570137
Subject(s) - diamagnetism , superconductivity , electron , oxygen atom , oxygen , crystallography , condensed matter physics , chemistry , materials science , physics , atomic physics , molecule , magnetic field , organic chemistry , quantum mechanics
The bonding distances between atoms in five different structure types of superconductors, Nb 3 Sn, (La, Sr) 2 CuO 4 , YBa 2 Cu 3 O 7–δ , Bi 2 Sr 2 CaCu 2 O x and Tl 2 Ca 2 Ba 2 Cu 3 O 8+ x were calculated. There are many shrunken bonds in all the five compounds. T c increases with the decrease in atomic distance of cations, rather than that of Cu–O. Structures which have large rhombicity tends to have higher density without the application of ultra‐high pressure owing to the existence of a large number of oxygen; that is, the more the number of oxygen anions surrounding the cations increases, the more the radii of cations shrink. In shrunken atoms, electron orbits are forced to condense toward to the nucleus, it is considered that superconducting electrons are apparently created and perfect diamagnetism is derived from inner filled bands.