Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1784847 | Infrared Physics & Technology | 2008 | 4 Pages |
Abstract
We show how coherent synchrotron radiation (CSR) allows one to measure the slight increase in the reflectivity of a BCS superconductor as it is cooled below Tc. In fact, by CSR coupled to a conventional interferometric apparatus, one can obtain a signal-to-noise ratio â¼103 in the sub-THz range. We apply this technique to the measurement of the optical gap in boron-doped diamond and in CaAlSi, a superconductor isostructural to MgB2. In the latter compound we are also able to determine a slight anisotropy between the gap in the hexagonal planes and that along the orthogonal c axis.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Atomic and Molecular Physics, and Optics
Authors
P. Calvani, S. Lupi, M. Ortolani, L. Baldassarre, C. Mirri, R. Sopracase, U. Schade, Y. Takano, T. Tamegai,