Relative Cooling Power and Temperature Averaged Entropy Change in La1.34Sr1.66Mn₂ O₃: Magnetocaloric Effects

In this digest, we explore the structural, magnetic, and Magnetocaloric characteristics of the Ruddlesden-Popper manganite La 1.34 S 1.66 Mn 2 O 7 synthesized via the solid-state reaction method. X-ray diffraction analysis reveals a tetragonal crystal structure with space group I4/mmm. The sample exhibits a metal-insulator transition at T MI =128.47 K at 0T and 183.07 K at 8T. Magnetization measurements reveal a paramagnetic to ferromagnetic transition at T C , which is 113 K at 0.01 T and shifts to 164 K at 7 T. The magnetocaloric performances are assessed by calculating the maximum magnetic entropy change (Δ Sm ), relative cooling power (RCP), and temperature-averaged entropy change (TEC) with a 5 K increment. The Δ Sm are 0.6, 3.0 and 3.7 J/kgK under a magnetic field of 0.5, 4 and 7 T respectively, attributed to the establishment of long-range ferromagnetic ordering with increasing magnetic field. Proper ferromagnetic ordering results in the broadening of the (δ TFWHM ), enhancing the RCP from 12.12 to 201.45 J/kg with a field change from 0.5 to 7 T. The TEC value is maximum at lower ΔT H-C values, 4.12 (3.00) J/kg K for 7(4) T.