Effects of higher order harmonics in the gap function on high Tc superconducting properties

Thumbnail Image
Kumakura, Hitomi
Journal Title
Journal ISSN
Volume Title
University of Guelph

Effects of the higher-order harmonics in the d-wave gap function have recently been suggested by some experiments on high-'Tc' superconductors. For some materials, the electron-doped ones for example, the properties calculated using only the first harmonic in the d-wave gap do not agree with the experiments. By including the effects of higher-order harmonics, we can reproduce variations in the d-wave gap symmetry, such as the non-monotonic variations revealed by electronic Raman scattering (G. Blumberg ' et al.' 2002). We investigate the effects of those harmonics, in the cases of a circular Fermi surface and a tight-binding Fermi surface, by calculating important properties such as the temperature-dependent penetration depth, the electronic Raman response functions, the energy-dependent density of states, the specific heat jump at 'Tc', and the gap ratio.

higher order harmonics, d-wave gap, high-Tc superconductors, Raman scattering