We explore the coexistence region in the vicinity of the Mott critical end point employing a compressible cell spin- Ising-like model. We analyze the case for the spin-liquid candidate -(BEDT-TTF)Cu(CN), where close to the Mott critical end point metallic puddles coexist with an insulating ferroelectric phase. Our results are fourfold: (i) a universal divergent-like behavior of the Grüneisen parameter upon crossing the first-order transition line; (ii) based on scaling arguments, we show that within the coexistence region, for any system close to the critical point, the relaxation-time is entropy-dependent; (iii) we propose the electric Grüneisen parameter , which quantifies the electrocaloric effect; and (iv) we identify the metallic/insulating coexistence region as an electronic Griffiths-like phase. Our findings suggest that governs the dielectric response close to the critical point and that an electronic Griffiths-like phase emerges in the coexistence region.
Griffiths-like phase close to the Mott transition
Note: This paper is part of the Special Topic on Phase-Change Materials: Syntheses, Fundamentals, and Applications.
Isys F. Mello, Lucas Squillante, Gabriel O. Gomes, Antonio C. Seridonio, Mariano de Souza; Griffiths-like phase close to the Mott transition. J. Appl. Phys. 14 December 2020; 128 (22): 225102. https://doi.org/10.1063/5.0018604
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