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Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Properties and Electronic Structure

TT 17.8: Vortrag

Montag, 16. März 2015, 16:45–17:00, H 2053

Light induced superconductivity in underdoped YBa2Cu3Ox — •Stefan Kaiser1,2,3, Daniele Nicoletti1, Cassi Hunt1, Wanzheng Hu1, Roman Mankowsky1, Michael Först1, Isabella Gierz1, Toshinao Loew2, Mathieu LeTacon2, Bernhard Keimer2, and Andrea Cavalleri11Max-Planck-Institut für die Struktur und Dynamik der Materie, Hamburg — 2Max-Planck-Institut für Festkörperforschung, Stuttgart — 34. Physikalisches Institut und Research Center SCoPE, Uni Stuttgart

Photo-stimulation with femtosecond mid-infrared pulses allows us to induce an inhomogeneous non-equilibrium superconducting state in YBa2Cu3Ox at temperatures as high as 300 K. Its transient response is probed via THz time-domain spectroscopy [1,2]. We measure and characterize its complex optical response above and below the superconducting transition temperature Tc: Below Tc, we find an enhancement of the optical signatures of superconducting coherence. Above Tc we find that the incoherent optical properties at equilibrium become highly coherent with optical signatures very similar to the ones for superconductors below Tc. In the course of understanding these observations, ultrafast x-ray experiments at LCLS allow us observing reconstructed crystal structure in the transient superconducting state and the influence of competing CDW-order to the phonon-excitation [3,4].


[1] S. Kaiser et al., PRB 89, 184516 (2014).

[2] W. Hu et al., Nat. Mat. 13, 705 (2014).

[3] R. Mankowsky et al., arXiv:1405.2266.

[4] M. Först et al., PRB 90, 184514 (2014).

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