Volume 60, Number 2, October 2002
|Page(s)||288 - 294|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 October 2002|
Partial and macroscopic phase coherences in an underdoped thin film
Research Center for Superconductor Photonics, Osaka University and CREST-JST 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2 Department of Physiscs, Tokyo Institute of Technology and CREST-JST 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan
3 Kansai Advanced Research Center, Communication Research Laboratory Kobe 651-2492, Japan
Accepted: 25 July 2002
A combined study using the time-resolved pump-probe technique and the time domain terahertz transmission spectroscopy has been carried out to investigate the normal-state anomalies in underdoped Bi2Sr2CaCu2O. It was observed that a superconducting gap and a pseudogap coexist in the superconducting state. The pseudogap locally evolves below K simultaneously with the appearance of partial phase coherence with a short lifetime less than 1 ps. With decreasing temperature, the domains with a pseudogap developed and saturated at K, and the frequency-dependent superconductivity fluctuation appeared as cooperative phenomena among the partial phase-coherent domains. These experimental data show that the development of the partial coherent local domains with a pseudogap has an important role to switch from the partial to the macroscopic phase-coherent state.
PACS: 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.72.Hs – Bi-based cuprates
© EDP Sciences, 2002
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