Effect of potassium doping on physical properties of perovskites La0.8Cd0.2−xKxMnO3

Investigation of structural, magnetic and electric transport properties of half-doped chromium manganites La0.3R0.2Sr0.5Mn0.5Cr0.5O3 (R=La, Nd, Sm, and Gd)

“…The properties of perovskite oxides are strongly affected by the chemical factors, such as the average cationic radius 〉 〈 A r in the A-site [13][14][15] and the A-site cationic size mismatch [16,17], which is quantified by…”

“…, where x i is the fractional occupancy of A-site ion, r i is the corresponding ionic radius and A r is the average A-site ionic radius [16]. It has been shown that the decrease of 〉 〈 A r tends to diminish the Mn-O-Mn angle in perovskite manganites, which consequently reduces the band width (W) and the Curie temperature T C [18].…”

Effect of pb substitution on structural and electrical transport of La0.7Ca0.3−xPbxMnO3 (0≤x≤0.3) manganites

“…The interplay between the structural, charge ordering, orbital ordering, large magnetic entropy, high temperature coefficient of resistance (TCR), and intrinsic colossal magnetoresistance (CMR) [5][6][7][8][9] gives rise to fascinating complex properties and therefore the basic physics in these materials is rich. These physical properties are highly depend on the followings: doping (x) [10], the average radius of the A-site cations, or A 4 , and the sizedisorder arising from the mismatch between the A-site cations (defined as y r r [11][12][13][14][15][16][17][18][19][20]. A-site doping can be strongly influenced by the average ionic radius of the A-site (o r A 4 ), which exhibits a close relation between the bending of the Mn-O-Mn bond angle and the narrowing of the electronic band width [12].…”

Structure, magnetic and electrical transport properties of the perovskites La0.67−xEuxSr0.33MnO3

“…The properties of manganites are not only sensitive to the manganese valency but also strongly affected by chemical factors, such as the average cationic radius /r A S in the A-site [18][19][20] and the A-site cationic size mismatch [21,22], which is quantified by…”

“…x i is the fractional occupancy of A-site ions, and r i is the corresponding ionic radius [21]. For instance, when the hole concentration is kept constant in the Mn 3 þ -rich FM compositions.…”