Direct evidence of macroscopic quantum effects at high temperature

Citation
P. Silvestrini et al., Direct evidence of macroscopic quantum effects at high temperature, J SUPERCOND, 12(6), 1999, pp. 727-733
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SUPERCONDUCTIVITY
ISSN journal
0896-1107 → ACNP
Volume
12
Issue
6
Year of publication
1999
Pages
727 - 733
Database
ISI
SICI code
0896-1107(199912)12:6<727:DEOMQE>2.0.ZU;2-L
Abstract
We present experiments; on macroscopic quantum effects in Josephson junctio ns with different relevant junction parameters at a temperature well above the classical-quantum crossover temperature. This has been possible by exte nding the measurements on the escape rate out of the metastable state at hi gher sweeping frequency (dI/dt up to 100 A/sec.) in order to induce non-sta tionary conditions in the energy potential describing the junction dynamics . The non-stationary regime for the system allows a direct observation of e nergy level quantitation when the rate of change of the external energy, me asured in terms of the level spacing, is fast with respect to the thermal t ransitions between levels.