Temperature span of magnetocaloric effect in Nb-doped La_0.7Ca_0.3Mn_1−xNb_xO₃ (x=0, 0.002 and 0.01)

In this work, we report magnetocaloric effect of Nb-doped on La_0.7Ca_0.3Mn_1-xNb_xO₃ (x=0, 0.002 and 0.01). Maximum magnetic entropy change under applied field of 10 kOe obtained was –ΔS_{M max} of 4.69 J kg⁻¹ K⁻¹, 1.75 J kg⁻¹ K⁻¹ and 1.95 J kg⁻¹ K⁻¹ for x=0.0, 0.002 and 0.01, respectively. Total temperature span of both Nb-doped samples was 51 K. A slight Nb-doped obtained a temperature span that went through the temperature span of the sample without Nb-doped, meanwhile more increasing Nb-doped might cause a little enhancement of maximum magnetic entropy change.