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

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)1525-1528
Number of pages4
JournalPhysical Review Letters
Volume76
Issue number9
DOIs
Publication statusPublished - 1996 Jan 1

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grazing incidence
reflectance
conductivity
BCS theory
grazing
polarized light
incidence
frequency ranges
sensitivity
single crystals

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Somal, H. S., Feenstra, B. J., Schützmann, J., Kim, J. H., Barber, Z. H., Duijn, V. H. M., ... Van der Marel, D. (1996). Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN. Physical Review Letters, 76(9), 1525-1528. https://doi.org/10.1103/PhysRevLett.76.1525
Somal, H. S. ; Feenstra, B. J. ; Schützmann, J. ; Kim, Jae Hoon ; Barber, Z. H. ; Duijn, V. H.M. ; Hien, N. T. ; Menovsky, A. A. ; Palumbo, Mario ; Van der Marel, D. / Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN. In: Physical Review Letters. 1996 ; Vol. 76, No. 9. pp. 1525-1528.
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Somal, HS, Feenstra, BJ, Schützmann, J, Kim, JH, Barber, ZH, Duijn, VHM, Hien, NT, Menovsky, AA, Palumbo, M & Van der Marel, D 1996, 'Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN', Physical Review Letters, vol. 76, no. 9, pp. 1525-1528. https://doi.org/10.1103/PhysRevLett.76.1525

Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN. / Somal, H. S.; Feenstra, B. J.; Schützmann, J.; Kim, Jae Hoon; Barber, Z. H.; Duijn, V. H.M.; Hien, N. T.; Menovsky, A. A.; Palumbo, Mario; Van der Marel, D.

In: Physical Review Letters, Vol. 76, No. 9, 01.01.1996, p. 1525-1528.

Research output: Contribution to journalArticle

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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 - Kim, Jae Hoon

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.

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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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Somal HS, Feenstra BJ, Schützmann J, Kim JH, Barber ZH, Duijn VHM et al. Grazing incidence infrared reflectivity of La1.85Sr0.15CuO4 and NbN. Physical Review Letters. 1996 Jan 1;76(9):1525-1528. https://doi.org/10.1103/PhysRevLett.76.1525