Issue |
Europhys. Lett.
Volume 45, Number 3, February 1999
|
|
---|---|---|
Page(s) | 381 - 386 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1999-00175-8 | |
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
1
Solid State Physics Department, Jozef Stefan
Institute - 1001 Ljubljana, Slovenia
2
Materials Science Department, University of Cambridge - Cambridge,
UK
Received:
11
August
1995
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
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