The search for circular dichroism in high Tc superconductors (abstract)

K. B. Lyons, J. Kwo, J. F. Dillon, G. P. Espinosa, M. Mcglashan Powell, A. P. Ramirez, Lynn Schneemeyer

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Stimulated by recent predictions of broken time reversal symmetry in cuprate superconductors, we have carried out a study of the polar Kerr ellipticity (the ellipticity of normally reflected light with the incident beam linearly polarized) for various cuprate materials, both superconducting and nonsuperconducting. The technique used employs a rotating half wave retardation plate in order to discriminate against linear polarization effects. The results reveal a signature of a nonzero polar Kerr ellipticity which appears on cooling near 200 K in a variety of superconducting materials, and which is not observed in the corresponding insulating compounds. In this talk, in addition to summarizing these results, we plan to discuss the measurement technique itself in some detail. Measurements on both thin films and bulk samples will be discussed, together with a variety of tests on unrelated materials, which serve to eliminate various possible experimental artifacts.

Original languageEnglish
Number of pages1
JournalJournal of Applied Physics
Volume69
Issue number8
DOIs
StatePublished - 15 Apr 1991

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ellipticity
dichroism
cuprates
linear polarization
artifacts
signatures
cooling
symmetry
thin films
predictions

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Lyons, K. B., Kwo, J., Dillon, J. F., Espinosa, G. P., Mcglashan Powell, M., Ramirez, A. P., & Schneemeyer, L. (1991). The search for circular dichroism in high Tc superconductors (abstract). Journal of Applied Physics, 69(8). https://doi.org/10.1063/1.348075
Lyons, K. B. ; Kwo, J. ; Dillon, J. F. ; Espinosa, G. P. ; Mcglashan Powell, M. ; Ramirez, A. P. ; Schneemeyer, Lynn. / The search for circular dichroism in high Tc superconductors (abstract). In: Journal of Applied Physics. 1991 ; Vol. 69, No. 8.
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abstract = "Stimulated by recent predictions of broken time reversal symmetry in cuprate superconductors, we have carried out a study of the polar Kerr ellipticity (the ellipticity of normally reflected light with the incident beam linearly polarized) for various cuprate materials, both superconducting and nonsuperconducting. The technique used employs a rotating half wave retardation plate in order to discriminate against linear polarization effects. The results reveal a signature of a nonzero polar Kerr ellipticity which appears on cooling near 200 K in a variety of superconducting materials, and which is not observed in the corresponding insulating compounds. In this talk, in addition to summarizing these results, we plan to discuss the measurement technique itself in some detail. Measurements on both thin films and bulk samples will be discussed, together with a variety of tests on unrelated materials, which serve to eliminate various possible experimental artifacts.",
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Lyons, KB, Kwo, J, Dillon, JF, Espinosa, GP, Mcglashan Powell, M, Ramirez, AP & Schneemeyer, L 1991, 'The search for circular dichroism in high Tc superconductors (abstract)', Journal of Applied Physics, vol. 69, no. 8. https://doi.org/10.1063/1.348075

The search for circular dichroism in high Tc superconductors (abstract). / Lyons, K. B.; Kwo, J.; Dillon, J. F.; Espinosa, G. P.; Mcglashan Powell, M.; Ramirez, A. P.; Schneemeyer, Lynn.

In: Journal of Applied Physics, Vol. 69, No. 8, 15.04.1991.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Lyons, K. B.

AU - Kwo, J.

AU - Dillon, J. F.

AU - Espinosa, G. P.

AU - Mcglashan Powell, M.

AU - Ramirez, A. P.

AU - Schneemeyer, Lynn

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Y1 - 1991/4/15

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AB - Stimulated by recent predictions of broken time reversal symmetry in cuprate superconductors, we have carried out a study of the polar Kerr ellipticity (the ellipticity of normally reflected light with the incident beam linearly polarized) for various cuprate materials, both superconducting and nonsuperconducting. The technique used employs a rotating half wave retardation plate in order to discriminate against linear polarization effects. The results reveal a signature of a nonzero polar Kerr ellipticity which appears on cooling near 200 K in a variety of superconducting materials, and which is not observed in the corresponding insulating compounds. In this talk, in addition to summarizing these results, we plan to discuss the measurement technique itself in some detail. Measurements on both thin films and bulk samples will be discussed, together with a variety of tests on unrelated materials, which serve to eliminate various possible experimental artifacts.

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Lyons KB, Kwo J, Dillon JF, Espinosa GP, Mcglashan Powell M, Ramirez AP et al. The search for circular dichroism in high Tc superconductors (abstract). Journal of Applied Physics. 1991 Apr 15;69(8). https://doi.org/10.1063/1.348075