Displacive Excitation of Coherent Phonons in YBa_2Cu_3 O_7: An Optical Evidence for the Van-Hove Singularity
| dc.creator | Zeng, W. -S. | |
| dc.creator | Kuhl, J. | |
| dc.date | 1996-01-12 | |
| dc.date | 1996-08-26 | |
| dc.date.accessioned | 2026-07-07T09:02:24Z | |
| dc.date.available | 2026-07-07T09:02:24Z | |
| dc.description | The amplitude of displacive excitation of coherent phonons ({\it DECP}) in $YBa_2Cu_3O_7$ 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 | |
| dc.description | 4 pages, 5 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9601042 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9601042 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/148617 | |
| dc.subject | Condensed Matter | |
| dc.title | Displacive Excitation of Coherent Phonons in YBa_2Cu_3 O_7: An Optical Evidence for the Van-Hove Singularity | |
| dc.type | text |