Browsing by Subject "Oxide superconductors"
Now showing items 1-10 of 10
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Article
Anisotropy of the resistivity in the a-b plane of a superconducting YBa2Cu3O7-δ single crystal
(1996)We have measured the in-plane longitudinal resistivities pa and pb as functions of temperature and magnetic field. The measurements were all made on the same detwinned single crystal of YBa2Cu3O7-δ (YBCO). Defining Tc to ...
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Conference Object
ARPES studies of the superconducting gap in high-temperature superconductors
(Affiliation: Argonne Natl. Lab. and Univ. of, Illinois/Chicago, Chicago, IL, USA, United StatesCorrespondence Address: Ding, H.Argonne Natl. Lab. and Univ. of, Illinois/Chicago, Chicago, IL, USAUnited States, 1996)Using high resolution angle-resolved photoemission spectroscopy (ARPES), we measure the superconducting gap and its momentum dependence in the high temperature superconductors Bi 2Sr 2CaCu 2O 8 (Bi2212) and YBa 2Cu 3O 6.95 ...
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Article
C-axis josephson tunneling between YBa2Cu3O7 − δ and Pb: Direct evidence for mixed order parameter symmetry in a high- Tc superconductor
(1997)C-axis Josephson tunneling experiments in which a conventional superconductor (Pb) is deposited across a single twin boundary of a YBa2Cu3O7 − δ (YBCO) crystal. We measure the critical current as a function of the magnitude ...
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Article
Disorder-induced vortex phase transition in untwinned YBa2Cu3O7-δ crystal
(2000)Local magnetic measurements in an untwinned YBa2Cu3O7-δ crystal as a function of temperature, field and time reveal anomalies occurring along the same line BSS(T) in the field-temperature plane. We identify BSS(T) as a ...
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Article
Hall effect in detwinned single crystals of YBa2(Cu1-xZnx)3O7-δ in the mixed state
(1996)The effect of zinc doping on the mixed-state Hall effect in detwinned single crystals of YBa2Cu3O7-δ has been studied. We observe a sign reveral of the Hall effect in crystals with a superconducting transition temperature ...
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Article
Photothermal measurements of differential reflectivity of YBCO related to the symmetry of the superconducting order parameter
(1996)We have investigated symmetry of the differential optical response of single YBCO domains in the a-b plane. As a function of temperature, this response consists of a smooth background and a sharp peak in the vicinity of ...
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Article
Progress in photothermal microscopy of YBa2Cu3O7-x
(1998)We present recent differential optical reflectivity (DOR) measurements obtained at 633 nm (2.OeV), 780 nm (1.6eV), 1064 nm (1.16eV), and 1310nm (0.95 eV). We discuss calibration techniques which can correct for variations ...
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Article
Sign reversal of the Hall effect in YBa2(Cu1-x)3O7-δ single crystals
(1995)We have measured the in-plane Hall effect and in-plane resistivity of cobalt-doped YBa2Cu3O7-δ (YBCO) single-crystal samples. The concentration of cobalt ranged from 1 to 3%. As the applied field was varied, a sign reversal ...
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Article
Spin-gap and antiferromagnetic correlations in low-dimensional PbNi2-xAxV2O8 compounds (A = Mg, Co)
(2002)The effect of the impurity doping in the quantum-spin chains of the PbNi2V2O8 Haldane-gap compound is studied. We report elastic neutron scattering and bulk magnetic susceptibility measurements on the quasi-one-dimensional ...
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Article
Tunneling in Pb-YBCO junctions: Determining the symmetry of the pairing state
(1995)We report on our efforts to understand the origin of supercurrent observed in c-axis tunnel junctions on YBCO [Sun A. G. et al., Phys. Rev. Lett. 72, 2267 (1994).] by studying the phase coherence of a-axis/c-axis and ...