Measurement of c-axis optical absorptivity of La1.87Sr0.13CuO4

John T. Birmingham; Sabrina M. Grannan; Paul L. Richards; Ruediger Henn; Jens Kircher; Manuel Cardona; Aleksander Wittlin; V. H. M. Duijn; Alois A. Menovsky

doi:10.1117/12.241747

10 June 1996 Measurement of c-axis optical absorptivity of La_1.87Sr_0.13CuO₄

John T. Birmingham, Sabrina M. Grannan, Paul L. Richards, Ruediger Henn, Jens Kircher, Manuel Cardona, Aleksander Wittlin, V. H. M. Duijn, Alois A. Menovsky

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241747
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We have directly measured the c-axis optical absorptivity of a large single crystal of La_1.87Sr_0.13CuO₄ 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.

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John T. Birmingham, Sabrina M. Grannan, Paul L. Richards, Ruediger Henn, Jens Kircher, Manuel Cardona, Aleksander Wittlin, V. H. M. Duijn, and Alois A. Menovsky "Measurement of c-axis optical absorptivity of La_1.87Sr_0.13CuO₄", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241747

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