Journal ArticleDOI
Tc-suppression and hole concentration in Cu substituted YBa2(Cu1−xMx)3O7−δ with Fe, Co, Ni, Zn
TLDR
In this paper, the authors concluded that the pair-breaking of the Abrikosov and Gor'kov type by magnetic impurities is absent, or very small if it exists, both on the C(1) and Cu(2) sites.Abstract:
From the studies of the Cu substituted YBa 2 (Cu 1−x M x ) 3 O 7−y (M=Fe, Co, Ni, Zn) systems, it is concluded that the pair-breaking of the Abrikosov and Gor'kov type by magnetic impurities is absent, or very small if it exists, both on the C(1) and Cu(2) sites. The Hall coefficient is measured for the systems. There is a certain relation between T c and n H in the substituted materials with Fe and Co, while no relation is deduced from the Ni- and Zn-substituted ones.read more
Citations
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Crystal Structure of Tetragonal YBa_2Cu_ Co_δO_ (δ=0, 0.3)
TL;DR: In this article, the structure of tetragonal YBa2Cu2.7Co 0.3O7-γ was determined by X-ray and TOF neutron powder diffractometries.
Journal ArticleDOI
Effect of Ni doping on the thermal expansion of the high- superconductor
Ashok Rao,Ashok Rao +1 more
TL;DR: In this article, thermal expansion measurements were carried out for the Ni-substituted compounds with a high-resolution dilatometer using the three-terminal capacitance technique, which is sensitive enough to detect changes in of less than.
Journal ArticleDOI
Superconductivity induced phonon anomalies in the Raman spectra of Zn and Ni doped YBa2Cu3O7
TL;DR: In this article, the Raman spectra of YBa2(Cu1−xZnx)3O7 were analyzed as a function of temperature and Zn or Ni content and it was found that Zn substantially suppresses the superconductivity induced phonon softening whereas, Ni does not affect much that effect.
Journal ArticleDOI
Zn doping effect on point-contact spectra and excess current in Y(Gd)Ba2Cu3O7−δ symmetry of order parameter
A.I. Akimenko,V.A. Gudimenko +1 more
TL;DR: In this article, a small increase of Zn content (≈ 1%) in Y(Gd)Ba 2 Cu 3 O 7−δ takes place, which is consistent with the prediction of the theory assuming highly anisotropic s wave pairing of carriers.
Journal ArticleDOI
Magnetic correlations and disorder in a two-dimensional fermi liquid: Possible important effects for high-Tc superconductors
TL;DR: In this paper, the influence of magnetic correlations and disorder in a two-dimensional Fermi liquid is considered in connection with the occurrence of the superconducting state, and the electronic mass enhancement has been calculated taking into consideration the magnetic correlation effects and disorder.
References
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Journal ArticleDOI
Structural and physical properties of the metal (M) substituted YBa2Cu3-xMxO7-y perovskite.
Jean-Marie Tarascon,P. Barboux,P. F. Miceli,Laura Greene,G. W. Hull,M. Eibschütz,Steven A. Sunshine +6 more
TL;DR: In this paper, the origin of the orthorhombic-tetragonal transition and the importance of the Cu-O chains for superconductivity is discussed. But the behavior of these materials with respect to magnetic impurities is apparently different from conventional Bardeen-Cooper-Schrieffer-type superconductors, and any new mechanism proposed must be mostly sensitive to local structural disorder.
Journal ArticleDOI
Variation of superconductivity with carrier concentration in oxygen-doped YBa2Cu3O7-y.
Z. Z. Wang,J. Clayhold,Nai Phuan Ong,Jean-Marie Tarascon,Laura Greene,W. R. McKinnon,G. W. Hull +6 more
TL;DR: The Hall coefficient R/sub H/, the volume fraction f showing the Meissner effect, and the superconducting transition temperature T/sub c/ have been measured in the high-T/ sub c/ oxide YBa/sub 2/Cu/sub 3/O/sub 7-//sub y/ for a range of oxygen vacancy concentration 0.0.
Journal Article
Superconductivity in YBa2Cu3−xMxOy (M = Co, Fe, Ni, Zn)
TL;DR: Les resultats des mesures de susceptibilite magnetique montrent que le cuivre dans les sites Cu 2 (entre Y and la couche BaO) jouerait un role plus important dans la supraconductivite que le couvre din le sites Cu 1 (entres les couches BaO). Les fluctuations de spin (ou d'autres modes collectifs) seraient importantes pour la formation de paires de Cooper entre trous des orbitales 2p de l'oxy
Journal ArticleDOI
Superconductivity of YBa2Cu3-xMxOy (M = Co, Fe, Ni, Zn)
TL;DR: In this article, the superconductivity of the La1+xBa2-xCu3Oy system was examined by means of ac susceptibility measurements, and it was shown that holes doped mainly in the O 2p orbitals of the rock-salt-type BaO layers form Cooper pairs through some medium (spin fluctuations or possibly other collective modes) excited in the Cu2 layer.
Journal ArticleDOI
Superconductivity of Y1Ba2(Cu1-xFex)3Oy
Yasukage Oda,Hiroshi Fujita,Haruhisa Toyoda,Tetsuyuki Kaneko,Takao Kohara,Ichiroh Nakada,Kunisuke Asayama +6 more
TL;DR: In this paper, a systematic study on the superconductivity of Y1Ba2(Cu1-xFex)3Oy has been made down to 30 mK for various x values.