Single crystals of the CuIr2S4 exhibit a metal-insulator transition (MIT) at a critical temperature (Tc) 231 K, accompanied by simultaneous charge ordering and spin dimerization, making it an interesting system to study the interplay of interaction among many degrees of freedom. By employing low-frequency electrical noise spectroscopy, we observe that the power spectral density (PSD) of the resistance fluctuations peaks around Tc likely due to the formation of domains of opposite phase. The ultra-low frequency window of our measurements serves as a tool to measure the increased scattering of charge carriers near Tc, due to nucleation, pinning and/or propagation of domains. The probability density function (PDF) of the fluctuations in the transition region shows a significant deviation from the expected Gaussian behavior further supporting the intermixing of phases near Tc. In addition, an abrupt phase transition with a threshold behavior can also be triggered electrically from the insulating phase. The analysis of the PSD, PDF and 1/f behavior suggests a significant role of the domains in the electrically driven case too.
APS March Meeting Abstracts
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