Journal ArticleDOI
3d-Metal Doping (Fe,Co,Ni,Zn) Of The High Tc Perovskite YBa2Cu3O7-y
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TLDR
The structural, magnetic and superconducting properties of the mixed compounds YBa 2 Cu 3−x M x O 7-y (M = Ni,Zn, Fe and Co) are reported in this paper.Abstract:
The structural, magnetic and superconducting properties of the mixed compounds YBa 2 Cu 3−x M x O 7-y (M = Ni,Zn,Fe and Co) are reported. Values of y, determined by titration, are found to be dependent on the nature and amount of the doping. The range of solubility is greater for the Fe and Co compounds (x = 1) than for those with Ni or Zn (x = 0.3). The undoped material is orthorhombic and remains orthorhombic after substitution for Cu by Ni or Zn, whereas a tetragonal phase is observed when Fe, Co are substituted for Cu. DC resistance and AC susceptibility measurements show that T c is depressed from 90K (x = 0) to 45K (x = 0.2) for both the Ni and Zn doped compounds and T c is destroyed in the Fe and Co doped compounds when x reaches 0.4. We suggest that a valence of 2 be assigned to the Ni and Zn and 3 to the Fe and Co ions.read more
Citations
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Journal ArticleDOI
Light heavy-fermions in Zn and Ni doped 123 Cu-O superconductors
S.T. Ting,Y. Gao,Chan-Soo Jee,S. Rahman,J. E. Crow,T. Mihalisin,G.H. Myer,I. Perez,R. E. Salomon,Pedro Schlottmann,J. Schwegler +10 more
TL;DR: In this article, the temperature dependence of specific heat C(T) for YBa2(Cu1−xMx)3O7 (YBCO) with M = Zn and Ni and 1.2 λ LT = C (T) T at T = 1.5 K reaching values of 100-150 mJ⧸mol K2 for modest Zn/Ni doping.
Journal ArticleDOI
Interactions of various substrates with melted ErBa2Cu3Ox
TL;DR: In this article, the interactions of partially melted Er-Ba-Cu-O superconductors with various substrates including MgO, TiO2, SiC and PSZ were studied with the objective of finding an adequate buffer layer for a nickel-HTSC composite.
Patent
Josephson junction device of oxide superconductor having low noise level at liquid nitrogen temperature
TL;DR: In this article, a Josephson junction device consisting of two superconducting electrodes formed of an oxide superconductor and connected through a junction was shown to become the minimum noise at liquid nitrogen temperature.
Book ChapterDOI
Effect of Doping on Defect Structure and Phase Stability in Y-Based Cuprates: In-Situ Tem Studies
TL;DR: In this article, the defect structure in YBa2Cu3−xMxOy doped with Mg and Zn (M = Mg, Zn) is reported.
References
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Journal ArticleDOI
Possible high Tc superconductivity in the Ba-La-Cu-O system
TL;DR: In this paper, Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form, and samples with x=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound.
Journal ArticleDOI
Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure
Maw-Kuen Wu,J. R. Ashburn,C. J. Torng,Pei-Herng Hor,R. L. Meng,Li Gao,Z. J. Huang,Yongmei Wang,Ching-Wu Chu +8 more
TL;DR: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure.
Journal ArticleDOI
Substitution for copper in a high- T c superconductor YBa 2 Cu 3 O 7–δ
Yoshiteru Maeno,Tsukasa Tomita,Makoto Kyogoku,Satoshi Awaji,Yuji Aoki,Kenichi Hoshino,Asao Minami,Toshizo Fujita +7 more
TL;DR: In this article, the authors investigated superconductivity in a series of alloyed compounds, YBa2 (Cu1-xMx)3O7-δ with M = Fe, Co, Ni, Zn and Ga, in which metals M are partially substituted for Cu.
Journal ArticleDOI
Electronic structure of Ba Pb 1 − x Bi x O 3
L. F. Mattheiss,D. R. Hamann +1 more
TL;DR: In this paper, the authors used the self-consistent, scalar-relativistic, linear augmented plane-wave (LAPW) method and the virtual-crystal approximation.
Journal ArticleDOI
Temperature and composition dependence of the tetragonal-orthorhombic distortion in La2-xSrxCuO4- delta.
TL;DR: The temperature and composition dependence of the tetragonal-orthorhombic phase-transition temperature T/sub d/ in the high-temperature superconductor La/sub 2-//sub x/Sr/ sub x/CuO/sub 4-// sub delta/ is mapped using high-resolution powder x-ray diffraction and measurements of the thermal expansion.