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in subjects: "Copper Oxides"  
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Electronic structure of the iron-based superconductor LaOFeP

Description: The recent discovery of superconductivity in the so-called iron-oxypnictide family of compounds has generated intense interest. The layered crystal structure with transition metal ions in planar square lattice form and the discovery of spin-density-wave order near 130K seem to hint at a strong similarity with the copper oxide superconductors. A burning current issue is the nature of the ground state of the parent compounds. Two distinct classes of theories have been put forward depending on the… more
Date: February 15, 2010
Creator: Lu, D. H.; Yi, M.; /Stanford U., Phys. Dept. /SLAC, SSRL; Mo1, S.-K.; /Stanford U., Phys. Dept. /SLAC, SSRL /LBNL, ALS; Erickson, A. S. et al.
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Partner: UNT Libraries Government Documents Department
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New experiments elucidating the current limiting mechanisms of Ag-sheathed (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub x} tapes.

Description: Multiple current limiting mechanisms exist from the nanometer to millimeter scale in Ag-sheathed (Bi,Pb)-2223 tapes. Recent studies of the zero-field critical current density (J{sub c} (0T, 77K)), the irreversibility field (H*) and the crack microstructure elucidate these properties. We show that H*(77K) can vary significantly over the range {approximately}120-260 mT, independently of J{sub c} (0T, 77K). Cracks, actual or incipient, exist on the sub to several hundred micron scale. Surface magn… more
Date: January 15, 1999
Creator: Anderson, J. W.; Babcock, S. E.; Cai, X. Y.; Dorris, S. E.; Feldmann, M.; Jiang, J. et al.
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Partner: UNT Libraries Government Documents Department
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IRRADIATION EFFECTS ON THE SURFACE REACTIONS OF METALS. Summary Report for October 1, 1958 to November 1, 1959

Description: Weight increases during the oxidation of irradiated foils of pure copper were greater than for unirraaiated specimens. Enhanced reactivity appeared to be strongest in the thin-film region up to about 5 mu g/cm/sub 2/. Oxide film (Cu/ sub 2/O) thickness for both irradiated and unirradiated specimens was approximately 1200 A. Radiation did not affect the reduction of Cu/sub 2/O during the induction period (period in which the reduction proceeds very slowly or not at all). In later stages of the r… more
Date: December 15, 1959
Creator: Carpenter, F. D. & White, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Practical superconductor development for electrical power applications - quarterly report for the period ending December 31, 2000

Description: This is a multiyear experimental research program focused on improving relevant material properties of high-T{sub c} superconductors (HTSs) and on development of fabrication methods that can be transferred to industry for production of commercial conductors. The development of teaming relationships through agreements with industrial partners is a key element of the Argonne National Laboratory (ANL) program. Recent results are presented on YBa{sub 2}Cu{sub 3}O{sub x} (Y-123) coated conductors, i… more
Date: January 15, 2001
Creator: Goretta, K.C.
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Partner: UNT Libraries Government Documents Department
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Isotopic Shifts in a Polaronic System

Description: The effect of isotopic substitution in a model polaronic system is presented. The authors use a three-site many body electron-phonon model which includes electronic correlations and electron-phonon interactions, showing the presence of polaron tunneling for intermediate and strong couplings. The isotopic substitution changes the dynamics of polaron tunneling. Additionally in the intermediate electron-phonon coupling regime, relevant for high-Tc superconductors, a change in the local structure i… more
Date: June 15, 1998
Creator: de Leon, J. M.; de Coss, R.; Rubia-Ponce, A.; Bishop, A. R. & Trugman, S. A.
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Partner: UNT Libraries Government Documents Department
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Magnetic correlations in doped transition metal oxides

Description: The authors review recent reactor- and spallation-source-based neutron scattering experiments on the magnetic fluctuations and order in a variety of doped transition metal oxides. In particular, data are shown for the NiO chain compound, Y{sub 2{minus}x}Ca{sub x}BaNiO{sub 5}, the two-dimensional cuprate superconductors La{sub 2{minus}x}Sr{sub x}CuO{sub 4} and YBa{sub 2}Cu{sub 3} O{sub 6+x}, and the classical three-dimensional ``Mott-Hubbard`` system V{sub 2{minus}y}O{sub 3}.
Date: February 15, 1995
Creator: Aeppli, G.; Bao, W. & Broholm, C.
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Partner: UNT Libraries Government Documents Department
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Electrochromism in copper oxide thin films

Description: Transparent thin films of copper(I) oxide prepared on conductive SnO2:F glass substrates by anodic oxidation of sputtered copper films or by direct electrodeposition of Cu2O transformed reversibly to opaque metallic copper films when reduced in alkaline electrolyte. In addition, the same Cu2O films transform reversibly to black copper(II) oxide when cycled at more anodic potentials. Copper oxide-to-copper switching covered a large dynamic range, from 85% and 10% photopic transmittance, with a c… more
Date: August 15, 2000
Creator: Richardson, T. J.; Slack, J. L. & Rubin, M. D.
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Partner: UNT Libraries Government Documents Department
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