Subterahertz electrodynamics of the graphenelike superconductor CaAlSi (Articolo in rivista)

Type
Label
  • Subterahertz electrodynamics of the graphenelike superconductor CaAlSi (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.77.054510 (literal)
Alternative label
  • Lupi, S; Baldassarre, L; Ortolani, M; Mirri, C; Schade, U; Sopracase, R; Tamegai, T; Fittipaldi, R; Vecchione, A; Calvani, P (2008)
    Subterahertz electrodynamics of the graphenelike superconductor CaAlSi
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lupi, S; Baldassarre, L; Ortolani, M; Mirri, C; Schade, U; Sopracase, R; Tamegai, T; Fittipaldi, R; Vecchione, A; Calvani, P (literal)
Pagina inizio
  • 054510 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 77 (literal)
Rivista
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  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • \"[Lupi, S.; Baldassarre, L.; Mirri, C.; Sopracase, R.; Calvani, P.] Univ Roma La Sapienza, CNR, INFM Coherentia, I-00185 Rome, Italy; [Baldassarre, L.; Schade, U.] Berliner Elekt Speicherring Gesellsch, Synchrontronstschlung mbH, D-12489 Berlin, Germany; [Tamegai, T.] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan; [Fittipaldi, R.; Vecchione, A.] Univ Salerno, INFM, CNR, Lab Reg Supermat, I-84081 Baronissi, Italy (literal)
Titolo
  • Subterahertz electrodynamics of the graphenelike superconductor CaAlSi (literal)
Abstract
  • We report an optical study of CaAlSi, a superconductor which displays both the crystal structure of MgB2 and the electronic band structure of intercalated graphites. The reflectivity of a CaAlSi single crystal was measured down to subterahertz frequencies and to 3.3 K, with the use of coherent synchrotron radiation. A single superconducting gap in the hexagonal planes and two gaps along the c axis were found and measured consistently with the structure of the CaAlSi Fermi surface. The normal-state optical conductivity is also anisotropic: in the ab plane, the plasma frequency is larger by more than a factor of 2 than along the c axis. An analysis of the ab-plane spectral weight in comparison with the corresponding quantity in a cuprate such as La2-xSrxCuO4 shows that in CaAlSi the correlation effects are negligible. (literal)
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