Phenomenological description of doped manganites. Electron bandwidth, crystal local structure and Curie temperature

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

“…This substitution has a direct effect on the DE interaction as well as weakens the FM coupling between Mn 3+ and Mn 4+ ions, leading to the lower ordering of FM transition temperature. Notably, the T C of the un-doped sample presented here is lower than those formerly published 8,22,23) and in agreement with those documented by Ulyanov et al 14) This difference could be due to the varied preparation conditions of the samples. Ulyanov et al 23) suggested that the high sintering temperature during synthesis triggers the oxygen deficiency in manganites, creating a decrease in the T C .…”

Investigation of the impact of A-site cation disorder on the structure, magnetic properties, and magnetic entropy change of trisubstituted divalent ions in La0.7(Ba,Ca,Sr)0.3MnO3 manganite

“…This has also been observed in perovskite manganite systems. [20][21][22][23][24][25][26][27][28][29] As the bandwidth increases, the overlap between the O-2p and Mn-3d orbitals also increases, leading to a higher exchange coupling among Mn 3+ -O 2À -Mn 4+ ions and the magnetic ordering temperature. 64 Consequently, this proves that T C not only depends on hr A i but also depends on the s 2 value.…”

“…19 As widely discussed in various studies on manganite perovskites, the increase in the hr A i value is directly proportional to the decrease in the hMn-Oi bond length while the increase in the hMn-O-Mni bond angle results in an increase in the hr A i value. [20][21][22][23][24][25][26][27][28][29] This effect influences electron mobility in the e g orbitals and the overlap of Mn-3d and O-2p orbitals. [20][21][22][23][24][25][26][27][28][29] According to many studies, an increase in the W value is accompanied by an increase in the T C value.…”

“…[20][21][22][23][24][25][26][27][28][29] This effect influences electron mobility in the e g orbitals and the overlap of Mn-3d and O-2p orbitals. [20][21][22][23][24][25][26][27][28][29] According to many studies, an increase in the W value is accompanied by an increase in the T C value. [20][21][22][23][24][25][26][27][28][29] Wang et al reported a linear trend of changes in hr A i values with changes in T C values.…”

“…[20][21][22][23][24][25][26][27][28][29] According to many studies, an increase in the W value is accompanied by an increase in the T C value. [20][21][22][23][24][25][26][27][28][29] Wang et al reported a linear trend of changes in hr A i values with changes in T C values. 30 Wang et al carried out variations in the value of hr A i with the partial substitution of Ca, Nd, and Y ions in La 1Àx A x MnO 3 , La 1Àx A x Mn 0.9 Cr 0.1 O 3 , and La 1Àx A x Mn 0.9 Fe 0.1 O 3 ,…”