Broadening of the magnetic entropy change in La0.75Ca0.15Sr0.10MnO3

A broad table-like entropy change (ΔS) at room temperature has been observed in the ferromagnetic compound La0.75Ca0.15Sr0.10MnO3, which is analyzed in the concept of Landau theory and with critical exponent analysis obtained from the magnetization measurements. The change in entropy in La0.75Ca0.15Sr0.10MnO3 is discussed in the light of magnetoelastic coupling between the magnetization and the lattice distortion. Application aspects of this unusual broad magnetocaloric effect with relative cooling power of 107 J kg−1 in an applied magnetic field of 1.6 T with an operating temperature range of 93 K around the room temperature are also discussed.

► Unusually broad table-like entropy change at room temperature in La0.75Ca0.15Sr0.10MnO3.
► Relative cooling power 107 J kg−1 with an operating temperature of 93 K in magnetic field of 1.6 T.
► Interesting for magnetic refrigeration as it gives relatively broad working temperature range.
► Critical exponent analysis shows an exponent value nearer to tricritical point exponent.
► Analyzed using Landau theory and discussed in the light of magnetoelastic coupling.