Zobrazeno 1 - 10
of 145
pro vyhledávání: '"J. Joffrin"'
Publikováno v:
physica status solidi (c). 1:2795-2798
At temperatures below about 30 mK in Si:B the phase relaxation time T2 of the two-level systems associated with the acceptor ground state can be determined from the decay of the two-pulse echo. It has been shown to depend on the concentration of inte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::667a2b178f809da89e8ba535651296f5
https://doi.org/10.1002/pssc.200405357
https://doi.org/10.1002/pssc.200405357
Publikováno v:
Physica B: Condensed Matter. :125-128
Phonon echoes, sound amplification, and acoustic solitons are observed in Si:B at temperatures below about 25 mK depending on the density of states of two-level systems associated with the acceptor ground state. We report on the influence of acceptor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::776882352dd117f2d88e0b152fc307c2
https://doi.org/10.1016/s0921-4526(02)00438-6
https://doi.org/10.1016/s0921-4526(02)00438-6
Publikováno v:
Solid State Communications. 110:115-119
We report electrical transport measurements of thin YBCO-films with three different oxygen contents in the mixed state, with a magnetic field applied perpendicular to the CuO2 layers. We have analysed our resistivity data in the framework of two mode
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::507ba363ead44d577cdf0455ab905570
https://doi.org/10.1016/s0038-1098(98)00608-5
https://doi.org/10.1016/s0038-1098(98)00608-5
Publikováno v:
Acta Physica Polonica A. 94:487-491
The elastic constants of single crystals of β-ΗgS highly g Y s g g Y with p iron were directly determined at room temperature from the measurements of ultrasonic wave velocities by the pulse-echo technique. The values of c11 = 6.750, c12 = 5.186, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3eb9b9f1286470c106722ccedc3c4bba
https://doi.org/10.12693/aphyspola.94.487
https://doi.org/10.12693/aphyspola.94.487
Publikováno v:
The European Physical Journal B. 2:177-182
We present measurements of the attenuation and phase velocity of surface acoustic waves in thin YBa2Cu3O YBa2Cu3O7‒δ films as a function of temperature, in magnetic fields up to 3.6 T applied parallel to the c-axis of the films. We have observed a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::269a7a88a8e0ed308db8dc7f75589d35
https://doi.org/10.1007/s100510050238
https://doi.org/10.1007/s100510050238
Publikováno v:
Journal of Low Temperature Physics. 105:1313-1318
Comparative studies of a standard four-contact DC method and a contactless mutual inductance setup have been carried out on the temperature dependence of the critical current of YBa2Cu3O7−δ (YBCO) thin films. The DC measurements are restricted to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4b54648a69c1b201db6d7ed16694634
https://doi.org/10.1007/bf00753882
https://doi.org/10.1007/bf00753882
Autor:
J.-Y. Prieur, M. Stenger, J. Joffrin, T. Königs, G. Ockenfuß, Roger Wördenweber, M. Reese, C. Barre
Publikováno v:
Solid State Communications. 98:777-780
In order to change the oxygen content of YBa 2 Cu 3 O 7−δ thin films, we have measured the YBCO c-axis length “in situ” by X-ray analysis while heating the films in a flow of 10 mbar of molecular oxygen. We observed two kinds of c-axis length
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97b753273bb9322fcdd9fdc312d46558
https://doi.org/10.1016/0038-1098(96)00201-3
https://doi.org/10.1016/0038-1098(96)00201-3
Publikováno v:
Physica B: Condensed Matter. :235-238
We discuss different possibilities to amplify an ultrasonic wave in a glass by inverting the populations of the two-level systems: we show that the only convenient one is the so-called “rapid adiabatic passage”. We describe different steps of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::72edc18a6869ae96e7564d4919ffdee9
https://doi.org/10.1016/0921-4526(95)00706-7
https://doi.org/10.1016/0921-4526(95)00706-7
Publikováno v:
Europhysics Letters (EPL). 24:409-414
Glassy systems have long been known to strongly attenuate ultrasonic waves at low temperatures. This is due to the resonant absorption of phonons by the so-called Two-Level Systems any amorphous medium contains. Should the populations of those TLS be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::781756c6ae23304f91002b509ce4604e
https://doi.org/10.1209/0295-5075/24/5/015
https://doi.org/10.1209/0295-5075/24/5/015
Publikováno v:
Physical Review B. 48:6604-6611
It has recently been shown that the low temperature acoustic properties of HTC superconductors in the presence of a strong magnetic field can give information on the thermally activated depinning of the vortex lattice [1].
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce7e26ee0a6c14bd92c5651e66b911ec
https://doi.org/10.1103/physrevb.48.6604
https://doi.org/10.1103/physrevb.48.6604