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Proceedings Paper

Measurement of c-axis optical absorptivity of La1.87Sr0.13CuO4
Author(s): John T. Birmingham; Sabrina M. Grannan; Paul L. Richards; Ruediger Henn; Jens Kircher; Manuel Cardona; Aleksander Wittlin; V. H. M. Duijn; Alois A. Menovsky
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Paper Abstract

We have directly measured the c-axis optical absorptivity of a large single crystal of La1.87Sr0.13CuO4 between 9 and 80 cm-1 at 2 K using Fourier transform spectroscopy and an absorbed power technique. We seen an absorptivity onset at 41 cm-1, which is 2 - 3 cm-1 higher than that measured at 6 K with reflectance on the same sample, suggesting that a significant fraction of the electrons remain unpaired at 6 K. The absorption increases with frequency below the onset, increasing from 0.3% at 9 cm-1 to 8% at 40 cm-1. Our data are particularly significant at frequencies below the plasma edge, for which the reflectance is close to unity.

Paper Details

Date Published: 10 June 1996
PDF: 4 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241747
Show Author Affiliations
John T. Birmingham, Univ. of California/Berkeley (United States)
Sabrina M. Grannan, Univ. of California/Berkeley (United States)
Paul L. Richards, Univ. of California/Berkeley (United States)
Ruediger Henn, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Jens Kircher, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Manuel Cardona, Max-Planck-Institut fuer Festkoerperforschung (Germany)
Aleksander Wittlin, Univ. of Nijmegen (Poland)
V. H. M. Duijn, Univ. of Amsterdam (Netherlands)
Alois A. Menovsky, Univ. of Amsterdam (Netherlands)


Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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