Structural, magnetic, magnetocaloric properties and critical behavior of La0.6Bi0.1Sr0.3−xCaxMn0.9Cu0.1O3 manganites (with x = 0.1 and 0.15)

Large Magnetocaloric Effect in Cu-Doped La_0.7Ca_0.3MnO₃ Compounds

“…Prior studies revealed a behavior similar to the one inspected here. 1,2,24) Particularly, for x = 0 and 0.08, the CW law downturn deviation was observed ranging from T C to the Griffiths temperature T G , which was acquired from the maximum of the first order deviation with respect to temperature of » ¹1 (T) curve (displayed in the inset of Fig. 4(b)).…”

“…MRs has been the subject of intense research due to its efficient cooling performance than a conventional vapor compression-based refrigerating system in addition to its environment friendly aspect. 2) Concerning La 1¹x A x MnO 3 , the parent compound of LaMnO 3 is an anti-ferromagnetic insulator, in which the valence state of Mn ions is 3+ (Mn 3+ ). 3) The La-site substitution with a divalent alkaline-earth ion (A, such as Ca 2+ , Ba 2+ or Sr 2+ ) would lead to the mixed valence of Mn 3+ /Mn 4+ occupying the Mn site.…”

The magnetocaloric effect properties for potential applications of magnetic refrigerator technology: a review

“…This is marked by a significant decrease in magnetization around T C as many research results. 20,60,115 To determine T C value more accurately, an analysis of the phase transition temperature is needed, where the determination is done by deriving M – T to temperature (d M /d T ). The analysis for determining the T C value was also conducted by Munazat et al , stating that the T C values for La 0.7 Ba 0.1 Ca 0.1 Sr 0.1 MnO 3 samples are 330.81 K and 316.17 K for SG and WM samples, respectively.…”

“…After a long time of undeveloped research related to an MCE, brown investigated pure gadolinium (Gd), in 1976 year, as a potential material for magnetic refrigeration applications. Gadolinium stood out due to its favorable properties, such as a Curie temperature (T C ) of 294 K around room temperature, magnetic entropy change of 10.2 J kg À1 K À1 , and relative cooling power of 410 J kg À1 under a magnetic field of 5 T. 20,21 This remarkable discovery of MCE materials has potential applications in magnetic refrigeration and cancer treatment using hyperthermia methods. 22 Therefore, Gd has become the standard reference for ideal MCE materials.…”

“…eqn (20), known as the Arrot plot formula, presents two Landau coefficients namely a(T), and b(T). Generally, the minimum value of a(T) represents the T C value according to the Landau expansion characteristics.…”