Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN

H. S. Somal; B. J. Feenstra; J. Schützmann; Jae Hoon Kim; Z. H. Barber; V. H.M. Duijn; N. T. Hien; A. A. Menovsky; Mario Palumbo; D. Van der Marel

doi:10.1103/PhysRevLett.76.1525

Grazing incidence infrared reflectivity of La_1.85Sr_0.15CuO₄ and NbN

H. S. Somal, B. J. Feenstra, J. Schützmann, Jae Hoon Kim, Z. H. Barber, V. H.M. Duijn, N. T. Hien, A. A. Menovsky, Mario Palumbo, D. Van der Marel

Department of Physics

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Infrared reflectivity measurements, using p-polarized light at a grazing angle of incidence, show an increased sensitivity to the optical conductivity of highly reflecting superconducting materials. We demonstrate that when this measurement technique is applied to the conventional s-wave superconductor NbN, the results are in perfect agreement with BCS theory. For the in-plane response of a La_1.85Sr_0.15CuO₄ single crystal, in the superconducting state, we find a reduction of the optical conductivity in the frequency range below 20 meV. The observed frequency dependence excludes an isotropic s-wave gap, but agrees well with model calculations assuming a d-wave order parameter.

Original language	English
Pages (from-to)	1525-1528
Number of pages	4
Journal	Physical review letters
Volume	76
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.76.1525
Publication status	Published - 1996

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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title = "Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN",

abstract = "Infrared reflectivity measurements, using p-polarized light at a grazing angle of incidence, show an increased sensitivity to the optical conductivity of highly reflecting superconducting materials. We demonstrate that when this measurement technique is applied to the conventional s-wave superconductor NbN, the results are in perfect agreement with BCS theory. For the in-plane response of a La1.85Sr0.15CuO4 single crystal, in the superconducting state, we find a reduction of the optical conductivity in the frequency range below 20 meV. The observed frequency dependence excludes an isotropic s-wave gap, but agrees well with model calculations assuming a d-wave order parameter.",

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T1 - Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN

AU - Somal, H. S.

AU - Feenstra, B. J.

AU - Schützmann, J.

AU - Hoon Kim, Jae

AU - Barber, Z. H.

AU - Duijn, V. H.M.

AU - Hien, N. T.

AU - Menovsky, A. A.

AU - Palumbo, Mario

AU - Van der Marel, D.

PY - 1996

Y1 - 1996

N2 - Infrared reflectivity measurements, using p-polarized light at a grazing angle of incidence, show an increased sensitivity to the optical conductivity of highly reflecting superconducting materials. We demonstrate that when this measurement technique is applied to the conventional s-wave superconductor NbN, the results are in perfect agreement with BCS theory. For the in-plane response of a La1.85Sr0.15CuO4 single crystal, in the superconducting state, we find a reduction of the optical conductivity in the frequency range below 20 meV. The observed frequency dependence excludes an isotropic s-wave gap, but agrees well with model calculations assuming a d-wave order parameter.

AB - Infrared reflectivity measurements, using p-polarized light at a grazing angle of incidence, show an increased sensitivity to the optical conductivity of highly reflecting superconducting materials. We demonstrate that when this measurement technique is applied to the conventional s-wave superconductor NbN, the results are in perfect agreement with BCS theory. For the in-plane response of a La1.85Sr0.15CuO4 single crystal, in the superconducting state, we find a reduction of the optical conductivity in the frequency range below 20 meV. The observed frequency dependence excludes an isotropic s-wave gap, but agrees well with model calculations assuming a d-wave order parameter.

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Grazing incidence infrared reflectivity of La_1.85Sr_0.15CuO₄ and NbN

Abstract

All Science Journal Classification (ASJC) codes

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