Optical absorptivity of La{sub 1.87}Sr{sub 0.13}CuO{sub 4} below the superconducting plasma edge
- Department of Physics, University of California, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
We have directly measured the far-infrared absorptivity of single crystal La{sub 1.87}Sr{sub 0.13}CuO{sub 4} at 2 K for radiation between 6 and 420 cm{sup {minus}1} polarized along the {ital c} axis. We have computed the dielectric functions {var_epsilon}{sup c}({omega}) and conductivity {sigma}{sup c}({omega}) using a Kramers-Kronig analysis. The existence of nonzero losses below the plasma edge and down to the lowest frequency measured is consistent with a model of a superconducting gap with nodes. From the calculation of {var_epsilon}{sup c}({omega}), we deduce a value of 230{plus_minus}10thinspcm{sup {minus}1} for the unscreened plasma frequency in the superconducting state. A small peak in the {sigma}{sub 1}{sup c}({omega}) is seen near 10 cm{sup {minus}1}. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 292718
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 59; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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