Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Venturini, A."'
Autor:
W.A. Ortiz, R. Caparroz, P.C. Venturini, Paulo Noronha Lisboa-Filho, C.C. de Faria, Sergei Sergeenkov, W. A. C. Passos, Fernando M. Araújo-Moreira
Publikováno v:
Physica C: Superconductivity. 354:189-196
This contribution presents a selected set of results, obtained as part of a systematic investigation, evidencing that many effects exhibited by superconductors are distinct manifestations of granularity which, in turn, is envisaged as a break of symm
Autor:
R. G. Dunn, Nancy A. Missert, Eugene L. Venturini, R. R. Padilla, P. Newcomer Provencio, Bruno Morosin
Publikováno v:
Physica C: Superconductivity. 302:119-129
Large single crystals of the Tl–Ba–Ca–Cu–O superconductors have been grown from fluxes including up to 30 mol% Rb of the amount of Tl employed. Various phases have been grown with lattice parameters and superconducting properties similar to c
Autor:
J.C. Barbour, P.P. Newcomer, E.L. Venturini, Bruno Morosin, Lumin Wang, Rodney C. Ewing, Mark L. Miller, James F. Kwak
Publikováno v:
Physica C: Superconductivity. 267:243-253
Ion irradiation damage creation and recovery were examined in Tl-based high temperature superconductors, HTSC, using TEM, resistivity, and magnetic measurements for irradiation temperatures of 20 to 650 K. During 1.5 MeV Kr + and Xe + ion irradiation
Publikováno v:
Physica C: Superconductivity. 241:181-186
Superconducting properties of Sr2CuO2F2+δ have been measured as a function of synthesis parameters. Fluorination initiates above 160°C, appears optimum near 180°C and is difficult to control above 250°C in forming superconducting samples. Optimum
Publikováno v:
Physica C: Superconductivity. 226:175-183
The superconductors, HgBa 2 Ca n Cu n +1 O 4+2 n +δ , with n =1,2 and 3 were prepared and annealed under a variety of conditions including high-pressure oxygen. Superconducting transition temperatures T c are determined as a function of oxygen annea
Autor:
Aravinda M. Kini, J. E. Schirber, K. D. Carlson, Hau H. Wang, John A. Schlueter, J.D.B. Sutin, Eugene L. Venturini, Jack M. Williams, W. R. Bayless
Publikováno v:
Physica C: Superconductivity. 227:10-14
This article describes the first study of the superconducting isotope effect on T c for β ∗ -(ET) 2 I 3 (also denoted as β H -(ET) 2 I 3 ), the crystallographically ordered form of β-(ET) 2 I 3 produced by application of a mild pressure, for 13
Autor:
Michael O. Eatough, James A. Voigt, Thomas J. Headley, S. B. Van Deusen, Eugene L. Venturini, T. L. Aselage
Publikováno v:
Physica C: Superconductivity. 203:25-36
High-temperature phase stability limits of TlCaBaCuO superconductors were determined as a function of Tl2O partial pressure at constant O2 partial pressure (≈630 Torr), sample temperature (880°C), and sample Ca:Ba:Cu ratio (1:2:2, 2:2:
Publikováno v:
Physica C: Superconductivity. 183:90-98
Two TlCa 2 Ba 2 Cu 3 O 9−δ (Tl-1223) single crystals have been sequentially annealed in flowing oxygen or nitrogen and the complete crystal structure determined by leastsquares refinement of Mo Kα X-ray diffraction data. Small atomic displacement
Publikováno v:
Physica C: Superconductivity. 175:241-249
We have shown that crystals in the TlCaBaCuO system are robust to anneals (oxygen, vacuum or 10%H 2 /90%N 2 ) to 500°C. Improvements in the superconducting properties, as determined from Meissner data, are observed for anneals above 300
Publikováno v:
Physica C: Superconductivity. 172:413-422
Substantial differences in the superconducting transition, both in width and onset temperature, for the same structure-type have been observed in “pseudo-flux” grown crystals in the Tl-Ca-Ba-Cu-O system. These differences have been attributed to