Velocity renormalization in high-Tc cuprates

Meir Weger

doi:10.1117/12.182691

10 August 1994 Velocity renormalization in high-T_c cuprates

Meir Weger

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182691
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We consider a low-density electron-gas (r_s equals 10 - 16) imbedded in a highly dispersive medium ((epsilon) ₀/(epsilon) _(infinity ) > 10). We find that the Fermi velocity is greatly enhanced over the single-particle value. This enhancement occurs only very close to the Fermi surface, within an energy range smaller than (omega) ₀, the characteristic frequency of the dispersion. This theory applies to high-T_c cuprates, as well as to several other systems. It accounts for the highly-anomalous transport properties in the normal state. We believe that it also accounts for the high value of T_c, based on the standard phonon- mediated interaction BCS theory. There exist some experimental indications for a greatly- enhanced Fermi velocity in YBa₂Cu₃O₇.

Citation Download Citation

Meir Weger "Velocity renormalization in high-T_c cuprates", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182691

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