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Study of the optical gap in novel superconductors by coherent THz radiation (Articolo in rivista)
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- Study of the optical gap in novel superconductors by coherent THz radiation (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
Calvani, P; Lupi, S; Ortolani, M; Baldassarre, L; Mirri, C; Sopracase, R; Schade, U; Takano, Y; Tamegai, T (2008)
Study of the optical gap in novel superconductors by coherent THz radiation
in Infrared physics & technology
(literal)
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- Calvani, P; Lupi, S; Ortolani, M; Baldassarre, L; Mirri, C; Sopracase, R; Schade, U; Takano, Y; Tamegai, T (literal)
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- \"[Calvani, P.; Lupi, S.; Baldassarre, L.; Mirri, C.; Sopracase, R.] Univ Roma La Sapienza, CNR, INFM Coherentia, Rome, Italy; [Calvani, P.; Lupi, S.; Baldassarre, L.; Mirri, C.; Sopracase, R.] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy; [Ortolani, M.; Schade, U.] Berliner Elektronenspeicherring Gesellschaft Sync, D-12489 Berlin, Germany; [Takano, Y.] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan; [Tamegai, T.] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan (literal)
- Titolo
- Study of the optical gap in novel superconductors by coherent THz radiation (literal)
- 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 T-c. In fact, by CSR coupled to a conventional interferometric apparatus, one can obtain a signal-to-noise ratio similar to 10(3) 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. (c) 2007 Elsevier B.V. All rights reserved. (literal)
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