Low frequency noise with 1/f-type spectra has been observed in a wide variety of systems including fluctuations in resistors, various materials or even intensity fluctuations in music. Nevertheless, 1/f noise (or flicker noise) is a controversial phenomenon because the physical mechanism that gives rise to the manifestation of this noise type is still a point of debate. Thus, a considerably small number of papers have been dedicated to the investigation of noise in ferroelectrics [1,2]. In this work detailed investigation of low frequency noise characteristics of CuInP2S6 will be presented. To obtain a deeper insight into the phenomena of 1/f noise in CuInP2S6 crystal in the vicinity of phase transition, we investigated normalized voltage fluctuation density having a spectra of Lorentzian-type. In this study we tried to explain observed relaxational physical processes in the phase transition region based oneself on the carrier numbers fluctuation.
P. Jain et al.
[1] J. Banys, T. Ramoska, J. Matukas, S. Pralgauskaite, F. M. M. Alwaneh, V. V. Shvartsman and D.C. Lupascu. Ferroelectrics 417, 25-32 (2011).
[2] S. Pralgauskaitč, J. Matukas, R. Grigalaitis, J. Banys, I. Zamaraitč, M. M. Vitajovic Petrovic, J. D. Bobic, B. D. Stojanovic. Noise and Fluctuations (ICNF), International Conference on, Xian, 2015, 1-4 (2015).