Zobrazeno 1 - 10
of 102
pro vyhledávání: '"S. Gygax"'
Publikováno v:
Physica C: Superconductivity. 292:189-196
Thin whiskers of orthorhombic Bi 2 Sr 2 Ca 1 Cu 2 O x have been grown from powders and their resistive transitions have been studied at constant current. The potential difference between the voltage electrodes on some of the whiskers showed an abrupt
Publikováno v:
Superconductor Science and Technology. 10:857-861
Eight electrical silver contacts were attached to very small and thin orthorhombic Bi2212 single-crystal whiskers by the application of pressure in a small cell developed especially for this purpose. No heating treatment of the sample and the contact
Publikováno v:
Journal of Crystal Growth. 152:280-285
Superconducting whiskers grown from BiSrCaCuO powders during a sintering process have been studied as a function of the starting mixture and sintering cycles. Experiments using X-ray diffraction, electron diffraction, EDX, HREM, magnetiza
Autor:
G Soerensen, S Gygax
Publikováno v:
Physical Review B. 51:11848-11859
The oxygen isotope effect measurements on YBa{sub 2}Cu{sub 3}O{sub 7} substituted with Pr, Ca, and Zn, which were reported earlier, have been analyzed in detail to examine the validity of the large increases in the isotope coefficient at low critical
Publikováno v:
Physical Review B. 44:5318-5321
The oxygen isotope effect was studied in the system (Y{sub 1{minus}{ital x}}Pr{sub {ital x}})Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} for {ital x}=0.2, 0.3, 0.4, and 0.5. It is found that the oxygen isotope exponent {alpha} increases with increasing
Autor:
J. C. Irwin, J. Chrzanowski, G. Salomons, J. Jung, J.P. Frank, D.F. Mitchell, W.A. Miner, S. Gygax, M.A.-K. Mohamed, G.I. Sproule
Publikováno v:
Physica C: Superconductivity. 172:90-104
We report on measurements of the effect of 18O-16O substitution on the superconducting properties of Y1Ba2Cu3O7−δ. Substitutions were made by gas-exchange alone, and by gas exchange in conjunction with substituted BaCO3 and CuO. From Raman scatter
Publikováno v:
Physica C: Superconductivity. 165:328-334
The temperature and composition dependence of reflection spectra in the long wavelength infrared range are presented for the high- T c superconducting alloy YBa 2 (Cu 1- x Zn x ) 3 O 7- y , where x =0% and 40%. We have observed that the far-infrared
Publikováno v:
Physica C: Superconductivity. 293:280-282
We have studied c -axis IV -curves of nominal Bi2212 whiskers in a magnetic field applied in the crystalline a -direction. In zero applied field we observe branches in the IV -plane which for low fields are retained. For high currents, they all merge
Publikováno v:
Physica C: Superconductivity. 293:277-279
Silver pressure contacts were attached to very small two-phase whiskers of BiSrCaCuO and four-probe c -axis resistive transitions were measured. On cooling down, the high- T c phase shows up as an increase in resistance followed by the usual drop to
Publikováno v:
Superconductor Science and Technology. 4:S151-S153
YBa2Cu3O7-x powder was heat treated in hermetically sealed gold capsules at 100 kbar and 945 degrees C. The resulting product is superconducting without further oxygen treatment. Magnetically determined transition temperatures are near 92.6 K. The pr