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Resistance noise spectroscopy is applied to bulk single crystals of thequasi-two-dimensional organic Mott insulator$\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl both under moderate pressure and atambient-pressure conditions. When pressurized, the system can be shifted to theinhomogeneous coexistence region of antiferromagnetic insulating andsuperconducting phases, where percolation effects dominate the electronicfluctuations [J. M\"uller {\it et al.}, Phys. Rev. Lett. {\bf 102}, 047004(2009)]. Independent of the pressure conditions, at higher temperatures weobserve generic $1/f^\alpha$-type spectra. The magnitude of the electronicnoise is extremely enhanced compared to typical values of homogeneoussemiconductors or metals. This indicates that a highly inhomogeneous currentdistribution may be an intrinsic property of organic charge-transfer salts. Thetemperature dependence of the nearly $1/f$ spectra can be very well describedby a generalized random fluctuation model [Dutta, Dimon, and Horn, Phys. Rev.\Lett. {\bf 43}, 646 (1979)]. We find that the number of fluctuators and/ortheir coupling to the electrical resistance depends on the temperature, whichpossibly relates to the electronic scattering mechanisms determining theelectrical resistance. The phenomenological model explains a pronounced peakstructure in the low-frequency noise at around 100 K, which is not observed inthe resistivity itself, in terms of the thermally-activated conformationaldegrees of freedom of the ET molecules' ethylene endgroups.

Energy scales for electronic noise processes in the quasi-two-dimensional organic Mott system $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl