J. Phys. IV France 09 (1999) Pr10-283-Pr10-287
The pseudogap in the c-axis optical conductivity in high Tc-cupratesH. Won1 and K. Maki2
1 Department of Physics, Hallym University, Chunchon 200-702, South Korea
2 Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, U.S.A.
The pseudogap phenomenon is most remarkable in the underdoped region of high-Tc cuprates. Since the superconducting state in the optimally doped high-Tc cuprates is well described by the BCS-like d-wave superconductors, it is natural to assume that the pseudogap arises from the standard superconducting fluctuation. In particular in the layered compunds like high-Tc cuprates Varlamov and his coworkers pointed out the density of states (DOS) correction to the superconducting fluctuation will play the crucial role. However, unfortunately in their analysis d-wave nature of the high-Tc cuprates is ignored. Perhaps more seriously some unnecessary approximations were introduced in their analysis. The present theory gives somewhat different expressions of quasi-particle density of states for B = 0 and B ≠ 0, which can be tested experimentally.
© EDP Sciences 1999