Femtosecond Response of Quasiparticles and Phonons in Superconducting YBa2Cu3O7−δ Studied by Wideband Terahertz Spectroscopy

A. Pashkin; M. Porer; M. Beyer; K. W. Kim; A. Dubroka; C. Bernhard; X. Yao; Y. Dagan; R. Hackl; A. Erb; J. Demsar; R. Huber; A. Leitenstorfer

doi:10.1103/PhysRevLett.105.067001

Femtosecond Response of Quasiparticles and Phonons in Superconducting YBa2Cu3O7−δ Studied by Wideband Terahertz Spectroscopy

A. Pashkin, M. Porer, M. Beyer, K. W. Kim, A. Dubroka, C. Bernhard, X. Yao, Y. Dagan, R. Hackl, A. Erb, J. Demsar, R. Huber, A. Leitenstorfer

DOI 10.1103/PhysRevLett.105.067001 · Physical Review Letters

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Abstract

We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa2Cu3O7−δ after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the pump energy before the quasiparticles are thermalized. Our results attest to substantial electron-phonon scattering and introduce a powerful concept probing electron-lattice interactions in a variety of complex materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown