Zobrazeno 1 - 7
of 7
pro vyhledávání: '"Jean Muller"'
Publikováno v:
Physica B: Condensed Matter, Vol. 204, No 1-4 (1995) pp. 167-175
Recently, the unusual behaviour of the specific heat of the superconductors YBa2Cu3O7, Y2Ba4Cu7O15, and YBa2Cu4O8 at high field and low temperature was attributed to Zeeman splitting of localized states in the vortex cores [D. Sanchez et al., Physica
Publikováno v:
Physica B: Condensed Matter, Vol. 194-196 (1994) pp. 1495-1496
In order to investigate the nature of the superconducting transition of YBa2Cu3O7, polycrystalline samples with calorimetric transition widths of 0.4 to 0.5 K were selected. Their specific heat was measured with 0.01% resolution and 0.5% accuracy. Th
Publikováno v:
Physica B: Condensed Matter, Vol. 194-196 (1994) pp. 1497-1498
In order to characterize more precisely the superconducting transition of a quasi-2D superconductor, we quenched polycrystalline samples of Bi2Sr2CaCu2Ox from various locations of the (T; p(O2)) equilibrium diagram. A well-defined specific heat peak
Publikováno v:
Physica B: Condensed Matter, Vol. 194-196 (1994) pp. 1939-1940
A homogeneous batch of YBa2Cu3Ox porous ceramics was studied in detail as a function of the annealing temperature Ta. X-ray patterns and optical micrographs show definitely one single phase. Well separated double transitions are however observed, mos
Publikováno v:
Physica B: Condensed Matter. :1671-1672
Pure single phase Y 2 Ba 4 Cu 7 O 14+x (“247”) and two phase compositions containing either “123” or “124” inclusions were prepared under 85 bar oxygen pressure at 1000°C. The samples were characterized by X-ray diffraction, microprobe a
Publikováno v:
Physica B: Condensed Matter. :1335-1336
The specific heat of selected ceramic samples of the 81k-superconductor YBa 2 Cu 4 O 8 prepared under an oxygen pressure of 85 bar is investigated. For the most homogeneous sample, the coefficient of the “linear” term at T≪T c is γ * =4.9±0.2
Publikováno v:
Physica B: Condensed Matter. :1435-1436
We have carried out extensive magnetic measurements on a high purity Y 1 Ba 2 Cu 4 O 8±δ (124) sample. The large Meissner effect, comparable to that of our best Y l Ba 2 Cu 3 O 7 (1237) samples confirms the bulk nature of the superconductivity. The