Ultrafast mid-infrared response of YBa(2)Cu(3)O(7-delta) |
| |
Authors: | Kaindl Woerner Elsaesser Smith Ryan Farnan McCurry Walmsley |
| |
Institution: | Max-Born-Institut fur Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany. Department of Physics, Clarendon Laboratory, Oxford University, Oxford OX1 3PU, UK. Department of Pure and Applied Physics, Queen's University of Belfast. |
| |
Abstract: | Optical spectra of high-transition-temperature superconductors in the mid-infrared display a gap of in-plane conductivity whose role for superconductivity remains unresolved. Femtosecond measurements of the mid-infrared reflectivity of YBa(2)Cu(3)O(7-delta) after nonequilibrium optical excitation are used to demonstrate the ultrafast fill-in of this gap and reveal two gap constituents: a picosecond recovery of the superconducting condensate in underdoped and optimally doped material and, in underdoped YBa(2)Cu(3)O(7-delta), an additional subpicosecond component related to pseudogap correlations. The temperature-dependent amplitudes of both contributions correlate with the antiferromagnetic 41-millielectronvolt peak in neutron scattering, supporting the coupling between charges and spin excitations. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|