Journal ArticleDOI
Doping effect of Sr or Ca on single phased YBa2Cu3O7−y
TLDR
In this paper, the relation between superconductivity and phase structure in YBa2Cu3O7−y doped with Sr and Ca has been studied systematically by the measurements of superconductivities, phase structure and thermal analysis.Abstract:
The relation between superconductivity and phase structure in YBa2Cu3O7−y doped with Sr and Ca has been studied systematically by the measurements of superconductivity, phase structure and thermal analysis. It is found that, for series of YBa2−xCaxCu3O7−y as 0⩽x⩽0.25, the samples are of single phase, and their Tc decrease linearly with content of Ca; for series of YBa2−xSrxCu3O7−y as 0⩽x⩽1.25, the samples are of single phase, but their Tc can change with the content of Sr either monotonously or non-monotonously, depending on the preparation conditions. A strong correlation exists between Tc and the crystal structure of the samples. The results obtained suggest strongly that the intensity of the coupling between Cu-O planes and Cu-O chains is very important to the high-Tc superconductivity of YBa2Cu3O7−y.read more
Citations
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Journal ArticleDOI
Crystal chemical substitutions and doping of YBa2CU3Ox and related superconductors
TL;DR: A review of the literature on substitutions and their effect on the properties of the 90 K superconductor YBa 2 Cu 3 O δ (YBCO) can be found in this paper.
Journal ArticleDOI
Chemical pressure and other effects of strontium substitution in YBa2Cu3O9−δ
TL;DR: In this paper, a tetrahedral four-component phase diagram of the superconducting state of the Ba-Sr unit cell is described, and the response of the state upon applied and chemical pressure (the latter exerted at the Ba site) is analyzed.
Journal ArticleDOI
The synthesis of new phases related to YBCO by complete replacement of the chain copper sites
Colin Greaves,Peter R. Slater +1 more
TL;DR: In this paper, the extent to which new phases may be synthesized by the replacement of the chain Cu sites (Cu1) in the YBa/sub 2/Cu/sub 3/O/sub 7/ structure was examined.
Journal ArticleDOI
The effects of Sr and Ca on the magnetic irreversibility and fluctuation conductivity of YBCO-123
TL;DR: In this paper, the magnetic irreversibility of polycrystalline superconductors has been measured in fields up to 7 kOe and an oxygen depleted sample up to 40kOe, and the fluctuation magnetoconductivity of YBa 1.5 D 0.75Sr 0.25Cu3O6.
Journal ArticleDOI
Coherence transition in granular YBa2Cu3O7-δ, YBa2Cu2.95Zn0.05O7-δ, and YBa1.75Sr0.25Cu3O7-δ superconductors
TL;DR: In this paper, the electrical magneto-conductivity near the superconducting transition of YBa2Cu3O7-δ polycrystalline samples was studied experimentally in magnetic fields ranging from 0 to 400 Oe applied parallel to the current orientation.
References
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Journal ArticleDOI
Superconductivity in YBa2−xSrxCu3O7−δ
B.W. Veal,Wai-Kwong Kwok,A. Umezawa,G. W. Crabtree,James D. Jorgensen,J. W. Downey,L.J. Nowicki,A. W. Mitchell,Arvydas P. Paulikas,C. H. Sowers +9 more
TL;DR: In this article, the structure, resistivity, and Meissner effect measurements on YBa2−xSrxCu3O7−δ for 0
Journal ArticleDOI
Superconductivity in YBa/sub 2-//sub x/Sr/sub x/Cu/sub 3/O/sub 7-//sub delta/
B.W. Veal,W. K. Kwok,A. Umezawa,G. W. Crabtree,James D. Jorgensen,J. W. Downey,L.J. Nowicki,A. W. Mitchell,Arvydas P. Paulikas,C. H. Sowers +9 more
TL;DR: In this paper, structure, resistivity, and Meissner effect measurements on YBa/sub 2-//sub x/Sr/sub X/Cu/sub 3/O/sub 7- //sub delta/ for 0
Journal ArticleDOI
Superconductivity in YBa2Cu3-yNiyO7-δ
Yoshiteru Maeno,Tsutomu Nojima,Yuji Aoki,Masatsune Kato,Kenichi Hoshino,Asao Minami,Toshizo Fujita +6 more
TL;DR: In this paper, the superconductivity in alloyed compounds YBa2Cu3-yNiyO7-δ has been studied in order to gain direct insights on the roles different Cu sites play in electrical conduction.
Journal ArticleDOI
Superconductivity in modified systems based on YBa2Cu3O7−δ
TL;DR: In this paper, superconductivity in YBa 2 (Cu 1− x M x ) 3 O 7−δ was investigated with various 3D and other elements M substituted for Cu.
Journal ArticleDOI
Relaxation of Brinkman-Smith Mode in Superfluid3He-B between Parallel Plates
TL;DR: In this paper, the authors considered the relaxation of the Brlnkman-Smlth (B-S) mode in superfluld 3He-B placed between parallel plates and calculated the recovery of the magnetization as a function of time.