Giant caloric effects close to any critical end point

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 Grüneisen parameter ΓE 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 [5], paving thus way for venues field.