1999/10/01 by V. V. Kabanov, J. Demsar, J. Demšar +2 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.61.1477
published as Phys. Rev. B 61, 1477 (2000) · 3 postscript figures are included, will be published in Phys. Rev. B
arxiv created 1999/10/01 · openalex publication_date 2000/01/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The unusual slow carrier relaxation dynamics---observed in femtosecond pump-probe experiments on high-temperature superconductors and recently also in a charge-density-wave system---is analyzed in terms of a model for relaxation of carriers in intragap states. The data on YBa2Cu3O_7\ensuremath-\ensuremathδ near optimum doping and K0.3MoO3 are found to be described very well with the model using a BCS-like gap which closes at Tc. From the analysis of the data we conclude that a significant intragap density of localized states exists in these materials, which can be clearly distinguished from quasiparticle states by the time-resolved optical experiments because of the different time and temperature dependences of the photoinduced transmission or reflection. Localized charges are suggested to be the most likely origin of the intragap states, while the similarity of the response in the two materials appear to exclude spin and vortex excitations.