Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy

  title={Microscopic observation of superconducting fluctuations in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br by C-13 NMR spectroscopy},
  author={Tamotsu Kobayashi and Yoshihiko Ihara and Y. Saito and Atsushi Kawamoto},
  journal={Physical Review B},
We performed $^{13}$C-NMR experiment and measured spin-lattice relaxation rate divided by temperature $1/T_{1}T$ near the superconducting (SC) transition temperature $T_{c}$ in $\kappa$-(BEDT-TTF)$_{2}$Cu[N(CN)$_{2}$]Br ($\kappa$-Br salt), and $\kappa$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$ ($\kappa$-NCS salt). We observed the reduction of $1/T_{1}T$ starting at the temperature higher than $T_c$ in $\kappa$-Br salt. Microscopic observation of quasi-particle density of states in the fluctuating SC state… Expand
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