Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Resistivity studies under hydrostatic pressure on a low-resistance variant of the quasi-2D organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br: quest for instrinsic scattering contributionsStrack, C.; Akinci, C.; Pashchenko, V.; Wolf, B.; Uhrig, E.; Assmus, W.; Lang, M.; Schreuer, J.; Wiehl, L.; Schlueter, J. A.; Wosnitza, J.; Schweitzer, D.; Müller, J.; Wykhoff, J.
Resistivity measurements have been performed on a low (LR)- and high (HR)-resistance variant of the κ-(BEDT-TTF)2Cu[N(CN)2]Br superconductor. While the HR sample was synthesized following the standard procedure, the LR crystal is a result of a somewhat modified synthesis route. Judging by their residual resistivities and residual resistivity ratios, the LR crystal is of distinctly superior quality. He-gas pressure was used to study the effect of hydrostatic pressure on the different transport regimes for both variants. The main results of these comparative investigations are (i) a significant part of the inelastic-scattering contribution, which causes the anomalous ρ(T) maximum in standard HR crystals around 90 K, is sample dependent, i.e., extrinsic in nature; (ii) the abrupt change in ρ(T) at T* ≈ 40 K from a strongly temperature-dependent behavior at T>T* to an only weakly T-dependent ρ(T) at T
Physical Review B 72(2005), 054511
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