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Publikováno v:
Physical Review Letters. 72:1088-1091
The first order vortex melting transition in single crystal YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] is investigated for magnetic field direction close to [bold H][parallel][ital a][bold b]. For exact field alignment [bold H][parallel][ital a][bold
Publikováno v:
Physical Review Letters. 72:1092-1095
We present transport measurements in high quality untwinned crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ in fields up to 8 T. We find an extremely sharp resistive transition
Autor:
R. Liu, D. D. Koelling, A. J. Arko, B. W. Veal, C. G. Olson, Arvydas P. Paulikas, J.W. Downey, R. Blythe, John J. Joyce, H. Shi
Publikováno v:
Surface Science Reports. 19:121-142
Using high-resolution angle-resolved photoemission, the electronic structure of YBa 2 Cu 3 O x is examined when oxygen stoichiometries are varied in the range 6.2≤×≤6.9. Detailed measurements of the Fermi surface for YBa 2 Cu 3 O 6.9 are present
Autor:
Ulrich Welp, J.W. Downey, Valerii M. Vinokur, G. W. Crabtree, Wai-Kwong Kwok, Steven Fleshler
Publikováno v:
Materials Science Forum. :609-628
Publikováno v:
Physica C: Superconductivity and its Applications. 213:185-189
By systematically changing the oxygen concentration of YBa2Cu3O7−δ single crystals grown in Au-crucibles, we demonstrate that the incorporated Au-impurities have only a minor effect on the maximum in Tc due to overdoping. On the other hand, we dem
Autor:
J.W. Downey, G. W. Crabtree, B. M. Vlcek, Kurt Vandervoort, Ulrich Welp, H. K. Viswanathan, M. C. Frischherz, Marquis A. Kirk, S. Fleshler
Publikováno v:
Physical Review B. 48:4067-4073
We present measurements of the magnetization hysteresis on neutron- and proton-irradiated ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ single crystals. The crystals were irradiated to fl
Autor:
J.W. Downey, S. Fleshler, Morag K. Smith, Ulrich Welp, Valerii M. Vinokur, G. W. Crabtree, Wai-Kwong Kwok
Publikováno v:
Physical Review B. 47:14448-14461
The magnetoresistance of both twinned and detwinned single crystals of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] was measured as a function of magnetic field strength, orientation, and temperature to determine the pinning properties of twin boundarie
Autor:
J.W. Downey, German Müller-Vogt, Ulrich Welp, G. W. Crabtree, A. Erb, W. K. Kwok, S. Fleshler, H. Claus
Publikováno v:
Physical Review B. 47:12369-12372
High-resolution measurements of the reversible magnetization of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals which were grown in gold crucibles and zirconia crucibles reveal that, within the experimental accuracy, gold impurities do not
Publikováno v:
IEEE Transactions on Applied Superconductivity. 3:1483-1486
The angular dependence of the magnetoresistance was measured on the same single crystal of YBa/sub 2/Cu/sub 3/O/sub 7- delta / prepared initially with a superconducting transition temperature of 93 K and then annealed to obtain a transition temperatu