J. Phys. IV France
Volume 114, April 2004
Page(s) 361 - 362

J. Phys. IV France
114 (2004) 361
DOI: 10.1051/jp4:2004114083

Magnetic field dependent vibrational modes in $\kappa$-(ET) 2Cu(SCN) 2 organic superconductor

I. Olejniczak1, 1, J. Choi2, J.L. Musfeldt2, Y.J. Wang3, J.A. Schlueter4 and R.A. Klemm5

1  Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznañ, Poland
2  Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37932, USA
3  National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA
4  Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
5  Max-Planck-Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany

The infrared reflectance of the 10.4 K organic superconductor $\kappa$ (ET) 2Cu(SCN) 2 has been measured as a function of applied magnetic field at 4.2 K. We investigate changes in intramolecular vibrational modes between the superconducting (low field) and normal (high field) states, of interest for mechanistic reasons. It is shown that the $\nu $ 3 (A g), $\nu $ 60  (B 3g), and $\nu $ 21 (B 1g) modes display field dependence. These results suggest that intramolecular vibrational modes are involved in the superconducting to normal state transition in $\kappa$ (ET) 2Cu(SCN) 2 below Tc. Key words. Organic superconductors - infrared spectra - magnetooptical effects.

© EDP Sciences 2004