Ultrafast mid-infrared response of nonequilibrium excitations in the high Tc superconductor YBa2Cu3O7-δ

R. A. Kaindl; D. C. Smith; D. C. Smith; M. Woerner; C. J. Stevens; C. J. Stevens; G. A. Wagner; G. A. Wagner; J. E. Evetts; J. E. Evetts; J. F. Ryan; J. F. Ryan; T. Elsaesser

Quantum Electronics and Laser Science Conference
OSA Technical Digest (Optica Publishing Group, 1999),
paper QWC3

Ultrafast mid-infrared response of nonequilibrium excitations in the high T_c superconductor YBa₂Cu₃O_7-_δ

R. A. Kaindl, D. C. Smith, M. Woerner, C. J. Stevens, G. A. Wagner, J. E. Evetts, J. F. Ryan, and T. Elsaesser

Quantum Electronics and Laser Science Conference 1999

Baltimore, Maryland United States
23–26 May 1999
ISBN: 1-55752-571-4

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Metals and Superconductors (QWC)

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R. A. Kaindl, D. C. Smith, M. Woerner, C. J. Stevens, G. A. Wagner, J. E. Evetts, J. F. Ryan, and T. Elsaesser, "Ultrafast mid-infrared response of nonequilibrium excitations in the high Tc superconductor YBa2Cu3O7-δ," in Quantum Electronics and Laser Science Conference, P. Bucksbaum, R. Falcone, G. Agrawal, and Y. Yamamoto, eds., OSA Technical Digest (Optica Publishing Group, 1999), paper QWC3.

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Abstract

The (ab)-plane conductivity of high-temperature superconductors shows in a limited range of the infrared spectrum, i.e. 10 to 20 μm in YBa₂Cu₃O_7-_δ (YBCO), a sharp dip for temperatures below the superconducting transition temperature T_c, followed by a broad maximum at higher photon energies.¹ The nature of this mid-infrared absorption band which shows its largest amplitude for optimally doped material is currently not well understood although different models have been proposed to explain this behavior ranging from boson-mediated quasiparticle absorption to strongly energy dependent scattering rates of quasiparticles.¹·²

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