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Far-infrared ellipsometry of electrons and phonons in La1.87Sr0.13CuO4

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0921-4534(94)91822-8
Disciplines
  • Physics

Abstract

Abstract We measured the complex dielectric function from 30 to 680 cm −1 along the c axis of a large, high quality single crystal of La 1.87Sr 0.13CuO 4 at temperatures between 6 and 300K with a far-infrared Fourier-ellipsometer. We obtain the complex dielectric function directly, without Kramers-Kronig analysis. In agreement with findings of Tamasaku et al. [PRL 69, 1455 (1989)], our data indicate an almost complete blockade of c axis single-particle transport. We present accurate optical phonon data and discuss upper limits of the low temperature far-infrared c axis ac conductivity. We find an anomalously large strength of the 235 cm −1 optical phonon and discuss its possible origin.

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