Baroentropy change estimation using modified Maxwell equation through magnetization and resistivity measurements under pressure: An indirect method of barocaloric effect

Abstract

We investigate the baroentropy change on manganites (Δ S b M and Δ S b M- ρ ) using modified form of Maxwell’s equation through magnetization and magnetization-resistivity measurements. Hence, we choose two Mn-site doped pervoskite manganites Pr 0.6 Ca 0.4 Mn 0.96 Co 0.04 O 3 and Pr 0.6 Ca 0.4 Mn 0.96 Cr 0.04 O 3 due to strong correlation between magnetic and electrical properties. The two external perturbations such as magnetic field and hydrostatic pressure have a similar influence on magnetic and transport properties of manganite systems due to its strong coupling between spin, charge, and orbital degrees of freedom. Baroentropy change, similar to magneto entropy change, could be estimated by replacing magnetic field in Maxwell’s equation by pressure in perovskite manganites. The estimated values of Δ S b M and Δ S b M-ρ using proposed equations well agree with each other, justifying the use of these equations. As these values are deduced from pressure dependent magnetization and resistivity measurements, this method of baroentropy change estimation is very useful as well as reliable in order to select application-oriented systems from the manganites family. • H and P have a similar influence on magnetic and transport properties of manganites. • Two modified forms of Maxwell’s equation are proposed to estimate baroentropy changes. • ΔS b M and ΔS b M-ρ values completely rely on magnetization and resistivity of a system. • P and H increase the baroentropy change of selected Co and Cr doped systems. • These are reliable for manganites in which analogue in magnetic and transport properties.