Relaxation dynamics of optically excited quasi-particles in BSCCO

H. Murakami, T. Yasuda, Y. Tominari, T. Kiwa, M. Tonouchi, T. Uchiyama, I. Iguchi, Z. Wang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


To investigate the multi-excitation processes on the low-lying electronic structure of high-TC superconductors, time-domain pump and probe measurement has been carried out on under- and over-doped Bi2Sr2CaCu2O8+δ films. In the underdoped film, we found evidence for coexistence of two excitation states due to superconducting gap Δs and pseudogap Δp below TC. The observed relaxation processes of optically excited quasi-particles were well explained by two relaxation times of T-dependent τs and almost T-independent τp (0.7 ± 0.3 ps below 150 K). The τp existed up to T* ∼ 200 K and disappeared above 225 K. On the other hand, only one relaxation time, τs, was observed in the overdoped film at T = 10 K. The relaxation time, τs=4.2 ± 0.3 ps (below 40 K), for the underdoped sample was shorter than τs = 5.9 ± 0.2 ps (at T = 10 K) for the overdoped one, and about two times longer than τs = 2.1 ± 0.1 ps for YBa2Cu3O7-δ thin film.

Original languageEnglish
Pages (from-to)320-323
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue numberPART 1
Publication statusPublished - Oct 1 2002
Externally publishedYes


  • Pseudogap
  • Relaxation time
  • Thin film
  • YBCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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