Griffiths-like phase close to the Mott transition

We explore the coexistence region in the vicinity of the Mott critical end point employing a compressible cell spin- 1 / 2 Ising-like model. We analyze the case for the spin-liquid candidate κ-(BEDT-TTF) 2Cu 2(CN) 3, where close to the Mott critical end point metallic puddles coexist with an insulat...

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Bibliographic Details
Published in:Journal of applied physics 2020-12, Vol.128 (22)
Main Authors: Mello, Isys F., Squillante, Lucas, Gomes, Gabriel O., Seridonio, Antonio C., de Souza, Mariano
Format: Article
Language:English
Subjects:
Applied physics
Compressibility
Critical point
Ferroelectricity
Gruneisen parameter
Ising model
Parameter identification
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Summary:We explore the coexistence region in the vicinity of the Mott critical end point employing a compressible cell spin- 1 / 2 Ising-like model. We analyze the case for the spin-liquid candidate κ-(BEDT-TTF) 2Cu 2(CN) 3, 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 Γ E, which quantifies the electrocaloric effect; and (iv) we identify the metallic/insulating coexistence region as an electronic Griffiths-like phase. Our findings suggest that Γ E governs the dielectric response close to the critical point and that an electronic Griffiths-like phase emerges in the coexistence region.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0018604