Displacive Excitation of Coherent Phonons in YBa₂Cu₃ O₇: An Optical Evidence for the Van-Hove Singularity

1996/01/12 by Wen-Sheng Zeng, W. -S. Zeng, Zeng, W. -S. +3
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #Condensed Matter (cond-mat) #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9601042

4 pages, 5 figures

openalex publication_date 1996/01/12 · arxiv created 1996/08/26 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The amplitude of displacive excitation of coherent phonons (\it DECP) in YBa₂Cu₃O₇ observed in time-resolved spectroscopy increases by a very large factor of 15 between 20 K (below T_c) and 100 K (above T_c). Microscopic modelling of phonon excitation reveals that these amplitude changes of the \it A_1g mode phonons are related to the existence of the \it Van-Hove singularity (VHS) below but very close to Fermi energy. PACS numbers: 78.47.+p, 74.25.Gz, 74.25.Jb, 71.15.Fv

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