Volume 37, Number 9, March 1997
|Page(s)||627 - 632|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Observation of superconductivity-induced phonon frequency changes in the organic superconductor kappa-(BEDT-TTF)2Cu(NCS)2
Forschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik, P.O. Box 3640, D-76021 Karlsruhe, Germany
2 Institut for Materials Research, Tohoku University, Katahira 2-1-1, Aobaku, Sendai 980, Japan
3 International Superconductivity Technology Center, Shinonome 1-10-13, Kotoku, Tokyo 135, Japan
4 Institute for Advanced Science and Technology - Gakuen-cho 1-2, Sakai 593, Japan
5 Institut für Festkörperphysik, SFB 252, Hochschulstraße 8, D-64289 Darmstadt, Germany
6 Max-Planck-Institut für chemische Physik fester Stoffe, D-01187 Dresden, Germany
Accepted: 18 February 1997
Frequencies of transverse acoustic phonons were measured by inelastic neutron scattering on single crystals of the organic superconductor . Significant frequency changes were observed for phonon energies close to the superconducting energy gap on cooling the sample below the superconducting transition temperature . The observed relative shifts are large compared to those in the classical superconductor Nb and also larger than the shifts found recently in the high-Tc superconductor .
PACS: 74.25.Kc – Phonons / 74.70.Kn – Organic superconductors
© EDP Sciences, 1997
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