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TT: Fachverband Tiefe Temperaturen
TT 80: Low-Dimensional Systems - Poster Session
TT 80.12: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Unconventional thermal conductivity of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br — S. Kühlmorgen1, J. Wosnitza1, J. Müller2, T. Herrmannsdörfer1, and •R. Schönemann1 — 1Hochfeld-Magnetlabor (HLD), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany — 2Physikalisches Institut, Johann Wolfgang Goethe-Universität, Frankfurt, Germany
We have investigated the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br by means of high-resolution thermal-conductivity measurements. The thermal conductivity was measured in a wide temperature range between 0.15 and 17 K. Data were taken at fields up to 14 T in the super- and normal-conducting state of κ-(BEDT-TTF)2Cu[N(CN)2]Br. In the superconducting state, a strong increase of the thermal conductivity below the transition temperature is observed, passes through a maximum and decreases with further decreasing the temperature. This maximum disappears when higher magnetic fields are applied. From our measurements we can conclude that the phonons are the dominant carriers for thermal transport. In the investigated temperature range the thermal conductivity in the superconducting state is higher than in the normal state. Down to lowest temperatures, this is due to quasi-particle scattering which affects the mean free path of the phonons.