Giant caloric effects close to any critical end point

摘要: Abstract The electrocaloric (EC) effect, i.e., the reversible temperature change due to adiabatic variations of electric field, is great interest its potential technological applications in refrigeration. Based on entropy arguments, we present a new framework attain giant EC effects. Our findings are fourfold: i) employ recently-proposed Gruneisen parameter Γ E quantify effect and discuss advantages over existing so-called strength; ii) prediction caloric effects close any critical end point; iii) proposal key-ingredients enhance effect; iv) demonstration as proper probe quantum ferroelectricity connection with celebrated Barrett's formula. enable us interpret recently-reported large at room-temperature oxide multilayer capacitors (B. Nair et al. 2019), paving thus way for venues field.