Volume 45, Number 3, February 1999
|Page(s)||381 - 386|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Evidence for crossover from a Bose-Einstein condensate to a BCS-like superconductor with doping in from quasiparticle relaxation dynamics experiments
Solid State Physics Department, Jozef Stefan
Institute - 1001 Ljubljana, Slovenia
2 Materials Science Department, University of Cambridge - Cambridge, UK
Accepted: 22 November 1995
Time-resolved measurements of quasiparticle (QP) relaxation dynamics on the femtosecond timescale are reported as a function of temperature and doping in for (). In the underdoped state (, there is no evidence for any changes in the low-energy gap structure at Tc from either photoinduced QP absorption or QP relaxation time data. In combination with the sum rule, this implies the existence of pre-formed pairs up to a much higher temperature Near a rapid cross-over is observed, to a state where the QP recombination time diverges and the photoinduced QP density falls to zero at Tc, indicating the existence of a temperature-dependent superconducting gap which closes at Tc.
PACS: 74.25.Dw – Superconductivity phase diagrams / 74.25.Jb – Superconductivity: Electronic structure / 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter
© EDP Sciences, 1999
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.