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 language | English |
|---|---|
| Pages (from-to) | 1525-1528 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 76 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1996 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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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 journal › Article
TY - JOUR
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.
PY - 1996/1/1
Y1 - 1996/1/1
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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U2 - 10.1103/PhysRevLett.76.1525
DO - 10.1103/PhysRevLett.76.1525
M3 - Article
VL - 76
SP - 1525
EP - 1528
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 9
ER -