Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 19: Correlated Electrons: Low-dimensional Materials
TT 19.17: Vortrag
Dienstag, 28. März 2006, 18:15–18:30, HSZ 301
Sample-dependent resistivity profiles in κ -(ET)2Cu[N(CN)2]Br organic superconductors - interrelations with other normal- and superconducting-state properties — •C. Strack1, C. Akinci1, V. Paschenko1, B. Wolf1, E. Uhrig1, W. Assmus1, M. Lang1, J. Schreuer2, L. Wiehl2, J. Schlueter3, J. Wosnitza4, D. Schweitzer5, and J. Wyckhoff6 — 1Physikalisches Institut, J.W. Goethe-Universität Frankfurt, FOR 412 — 2Institut für Mineralogie, J.W. Goethe-Universität Frankfurt, FOR 412 — 3Materials Science Division, Argonne NL, Illinois, USA — 4Institut für Festkörperphysik, TU Dresden — 53. Physikalisches Institut, Universität Stuttgart — 6Max Planck Institut für Chemische Physik fester Stoffe, Dresden
The organic superconductor κ-(ET)2Cu[N(CN)2]Br shows striking sample-to-sample variations in the electrical resistivity [1]: While most of the crystals reveal a ρ(T) maximum around 90 K with a semiconducting behaviour above, some remain metallic for T<300 K. In the absence of significant differences in the crystals’ structural parameters, chemical composition and ESR spectra, these results indicate that real structure phenomena, i.e. disorder and/or defects, strongly affect the inelastic scattering [1]. Here we report on a comparative resistivity study on a variety of crystals with quite different ρ(T) profiles. The work aims at seeking out interrelations between the anomalous scattering contributions at intermediate temperatures and features of the normal- and superconducting-state, such as the glass transition at Tg ≈ 77 K, the temperature T* ≈ 40 K [1], as well as the superconducting transition temperature. [1] C. Strack et al., Phys. Rev. B 72, 054511 (2005)