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

@article{Kobayashi2014MicroscopicOO,
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},
year={2014},
volume={89},
pages={165141}
}
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
7 Citations

#### Figures from this paper

Ultrafast Carrier Dynamics in an Organic Superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br by Spectrally Resolved Pump-Probe Spectroscopy
• Materials Science
• 2019
In this work, spectrally resolved optical pump-probe measurements were carried out on strongly correlated organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br. We find two different types of carrierExpand
Coulomb-enhanced superconducting pair correlations and paired-electron liquid in the frustrated quarter-filled band
• Physics
• 2016
A necessary condition for superconductivity (SC) driven by electron correlations is that electron-electron (e-e) interactions enhance superconducting pair-pair correlations, relative to theExpand
Prediction of pseudogap formation due to d-wave bond-order in organic superconductor κ−(BEDT-TTF)2X
• Physics
• Physical Review Research
• 2021
The authors propose the emergence of $d$-wave smectic bond order in organic superconductor $\ensuremath{\kappa}$-(BEDT-TTF)${}_{2}$X due to the paramagnon interference mechanism.
From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Physics
• Physics Reports
• 2019
We review recent progress in understanding the different spatial broken symmetries that occur in the normal states of the family of charge-transfer solids (CTS) that exhibit superconductivity (SC),Expand
Superfluid density versus transition temperature in a layered organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br under pressure
• Materials Science
• 2020
This work studies the pressure dependence of the superfluid density through the magnetization measurements in a layered organic superconductor and finds that the superfluid density isExpand
Supplementary Information : Coulomb Enhanced Superconducting Pair Correlations in the Frustrated Quarter-Filled Band
• 2015
Exact diagonalization using the valence bond basis. The valence bond (VB) method is a well known numerical technique for studying correlated quantum systems [S1][S2][S3]. In the present work it isExpand
Petahertz non-linear current in a centrosymmetric organic superconductor
It is reported that, in a layered organic superconductor, a non-linear petahertz current driven by a single-cycle 6 femtosecond near infrared field shows up as second harmonic generation (SHG), which is in contrast to the common belief that even harmonics are forbidden in the centrosymmetric system. Expand