Giant caloric effects close to any critical end point

Author(s)

Squillante, Lucas ^[1] ; Mello, Isys F. ^[1] ; Seridonio, A. C. ^[2] ; de Souza, Mariano ^[1]

Affiliation

^[1] Sao Paulo State Univ Unesp, IGCE Phys Dept, Rio Claro, SP - Brazil

^[2] Sao Paulo State Univ Unesp, Dept Chem & Phys, Ilha Solteira, SP - Brazil

• Document type: Journal article
• Source: Materials Research Bulletin; v. 142, OCT 2021.
• Web of Science Citations: 0

Abstract

The electrocaloric (EC) effect, i.e., the reversible temperature change due to adiabatic variations of the electric field, is of great interest due to its potential technological applications in refrigeration. Based on entropy arguments, we present a new framework to attain giant EC effects. Our findings are fourfold: (i) we employ the recently-proposed electric Gruneisen parameter GE to quantify the EC effect and discuss its advantages over the existing so-called electrocaloric strength; (ii) prediction of giant caloric effects close to any critical end point; (iii) proposal of potential key-ingredients to enhance the EC effect; (iv) demonstration of GE as a proper parameter to probe quantum ferroelectricity in connection with the celebrated Barrett's formula. Our findings enable us to interpret the recently-reported large EC effect at room-temperature in oxide multilayer capacitors {[}5], paving thus the way for new venues in the field. (AU)

• FAPESP's process: 11/22050-4 - Exploring thermodynamic and transport properties of strongly correlated electron systems
• Grantee: Valdeci Pereira Mariano de Souza
• Support Opportunities: Regular Research Grants