Journal ArticleDOI
Magnetic Properties of O2-Annealed YBa2(Cu1-xMx)3Oy with M=Fe, Co and Ni
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In this article, the dc magnetic susceptibility of YBa 2 (Cu 1- x M x ) 3 O y with M=Fe and Co ( x < 0.08) annealed in high pressure oxygen gas was measured in the normal state.Abstract:
The dc magnetic susceptibility of YBa 2 (Cu 1- x M x ) 3 O y with M=Fe and Co ( x <0.08) annealed in high-pressure oxygen gas was measured in the normal state. The annealing was done in flowing oxygen gas of about 6 kg/cm 2 for 24 hours at low temperatures (350–450°C) after an ordinary annealing in air. Although the O 2 annealing markedly enhances the superconducting transition temperature, the measured susceptibilities of Fe and Co substituents were essentially unchanged. The dc magnetic susceptibilities of the air- and O 2 -annealed samples with Ni ( x <0.08) were also measured and found to be the same. In this compound, the Ni atom was found to have a magnetic moment close to that of the Ni 2+ ion ( S =1, P eff =2.83 µ B ).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
Tc-suppression and hole concentration in Cu substituted YBa2(Cu1−xMx)3O7−δ with Fe, Co, Ni, Zn
TL;DR: 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.
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Local moment formation at Cu(2) sites around Co atom in YBa2(Cu1-xCox)3O7+y studied by Cu-NQR
TL;DR: In this article, the authors investigated the NQR spectra in YBa 2 (Cu 1- x Co x ) 3 O 7+ y were investigated systematically from x = 0 to 018 in the normal state, T =100 K.
Journal ArticleDOI
Nuclear magnetic resonance in cobalt-doped YBa2Cu3O7
D P Tunstall,W J Webster +1 more
TL;DR: In this paper, four samples of YBCO doped with cobalt have been characterised using several techniques, including measurements of Tc, AC susceptibility, resistivity, magnetic susceptibility, and yttrium nuclear magnetic resonance (nmr).
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.
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Effect of transition-metal elements on the superconductivity of Y-Ba-Cu-O
TL;DR: The superconducting state was investigated by both resistance and magnetization measurements and the magnetic susceptibility above T/sub c/ was found to be strongly correlated with the size of the paramagnetic moments, largely due to scattering from the magnetic sites.
Journal ArticleDOI
Crystal Structures of YBa2Cu3-δAδO9-γ (A=Ni, Zn and Co)
TL;DR: In this article, the locations of the dopant atoms, Ni, Zn and Co, in the 1-2-3 (Y/Ba/Cu) oxide were determined by means of X-ray and time-of-flight type (TOF) neutron diffractometers.
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.