Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Albert Comberg"'
Publikováno v:
Physica C: Superconductivity. 182:291-296
By means of the recently established ultrasonic technique, activation energies for the vortex lattice of various high- T c superconductors are determined. These are deduced from the characteristic maximum in the field induced attenuation which is ass
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7aaf022935af14a82f789ce66587054
https://doi.org/10.1016/0921-4534(91)90525-4
https://doi.org/10.1016/0921-4534(91)90525-4
Publikováno v:
Physica C: Superconductivity. 174:289-302
The ultrasonic attenuation and velocity shift, induced by the vortex lattice of high- T c superconductors, are measured as a function of field, frequency and temperature. Two different ceramic samples, both of the Bi-2223 composition, are investigate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f9a86f66d84ac9f22a39a3447985d02
https://doi.org/10.1016/0921-4534(91)91559-m
https://doi.org/10.1016/0921-4534(91)91559-m
Publikováno v:
Physical Review Letters. 65:3052-3055
Measurements of the transverse sound attenuation and velocity in a ceramic ${\mathrm{Bi}}_{1.6}$${\mathrm{Pb}}_{0.4}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathit{y}}$ superconductor (${\mathit{T}}_{\mathit{c}}$=110
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80fc7239f012992cc4173ad45f1ef982
https://doi.org/10.1103/physrevlett.65.3052
https://doi.org/10.1103/physrevlett.65.3052
Autor:
G. Marbach, Helga Passing, S. Ewert, Christoph Hünnekes, Peter Lemmens, Albert Comberg, Philip Fröning
Publikováno v:
Journal of the Less Common Metals. :1129-1135
Sound velocity and attenuation measurements were performed on polycrystalline samples of the stoichiometry YBa2Cu3Ox and (Y1 − yPry)Ba2Cu3O7. The values of the bulk modulus and the Poisson ratio and their temperature dependences are affected by oxy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab0c80ad5f8c6edb15742b39627c694e
https://doi.org/10.1016/0022-5088(90)90527-q
https://doi.org/10.1016/0022-5088(90)90527-q
Publikováno v:
Zeitschrift f�r Physik B Condensed Matter. 78:345-359
Polarized neutrons and polarization analysis were used to determine the total amplitude of magnetic fluctuations in tetragonal YBa2Cu3O6+δ for energies below 30 meV, both in the magnetically ordered state below and in the paramagnetic state above th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ca81f9fa1891f2d6837b29214795ceb
https://doi.org/10.1007/bf01313315
https://doi.org/10.1007/bf01313315
Publikováno v:
Physica B: Condensed Matter. :1275-1276
Measurements of the transverse sound attenuation and velocity in ceramic YBa2Cu3Ox superconductors were performed with and without a magnetic field. We observe a pronounced peak in the field-induced attenuation and an increase of the velocity at low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12ed6222ee60de9d5199c47dcf4c0c85
https://doi.org/10.1016/s0921-4526(09)80223-8
https://doi.org/10.1016/s0921-4526(09)80223-8
Publikováno v:
Zeitschrift f�r Physik B: Condensed Matter and Quanta. 20:165-168
Tunneling experiments on Be films condensed onto helium cooled substrates show that these films are homogeneously disordered with a uniform transition temperatureTc when Ge is codeposited, whereas thick films of pure Be do not grow homogeneously. For
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfb190ab8c10fcea3d18eb55c209b6c9
https://doi.org/10.1007/bf01315686
https://doi.org/10.1007/bf01315686
Publikováno v:
Zeitschrift für Physik. 271:317-321
Thin and pure Tl-films and In-films with different impurities (Ag, Te, Ge, Sb) are condensed onto a cooled substrate at 4 K. Measurements of the energy gap by means of the tunnel effect and the transition temperature of the weak-coupling superconduct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::826a5c36994fc76487be2aad044a6ec7
https://doi.org/10.1007/bf01677942
https://doi.org/10.1007/bf01677942
Autor:
J. Wynants, S. Ewert, Simon Guo, Peter Lemmens, Albert Comberg, Helga Passing, Dorothee Bonnenberg, G. Arlt, F. Stellmach, H. Kliem
Publikováno v:
Solid State Communications. 64:1153-1156
Ultrasonic velocity and attenuation measurements down to 4.2 K were performed on well characterized ceramic superconducting YBa 2 Cu 3 O 7-δ samples of different microstructure. In fine grained samples of high volume density and excellent supercondu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebbb5e82cc69260fa07c44b1e087f846
https://doi.org/10.1016/0038-1098(87)90609-0
https://doi.org/10.1016/0038-1098(87)90609-0
Autor:
S. Ewert, Albert Comberg
Publikováno v:
Zeitschrift für Physik. 268:241-244
Thin Tl/Te-films are condensed onto a cooled substrate at 4 K. An amorphous phase is obtained. The maximum superconducting transition temperature of the amorphous Tl/Te-films is 4.2 K. Measurements of the energy gap by superconducting tunneling yield
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8dac7d5459713152249646297f82b1c
https://doi.org/10.1007/bf01669886
https://doi.org/10.1007/bf01669886