Far-infrared {ital c}-axis response of La{sub 1.87}Sr{sub 0.13}CuO{sub 4} determined by ellipsometry
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, 70569 Stuttgart (Germany)
- High Field Magnet Laboratory, University of Nijmegen, NL-6525 ED Nijmegen (The Netherlands)
- Department of Physics, University of Amsterdam, NL-1018 XE Amsterdam (The Netherlands)
We have measured the {ital c}-axis optical response of a large, high-quality single crystal of La{sub 1.87}Sr{sub 0.13}CuO{sub 4} between 30 and 700 cm{sup {minus}1} in the 10{endash}300 K temperature range with a far-infrared Fourier ellipsometer. Since ellipsometry provides both amplitude and phase information, we directly obtain the complex dielectric function, thereby avoiding the errors introduced by the Kramers-Kronig transformation or the reference determination. A purely algebraic treatment of our data within the two-fluid Gorter-Casimir model reveals no indication of a reduction of the normal carrier scattering rate {Gamma} below {ital T}{sub {ital c}}. We obtain {Gamma}{approx_equal}130{plus_minus}70 cm{sup {minus}1} and a plasma frequency for the superconducting carriers of {omega}{sub {ital ps}}{approx_equal}260{plus_minus}40 cm{sup {minus}1}. Thus, assuming a weak-coupling BCS gap (3.5{ital k}{sub {ital BT}}{sub {ital c}}{approx_equal}77 cm{sup {minus}1}, with {ital T}{sub {ital c}}=31.5 K) we conclude that the {ital c}-axis optical response of La{sub 1.87}Sr{sub 0.13}CuO{sub 4} can neither be modeled within the clean nor with the dirty limit. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 280196
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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