Structural and magnetic properties of rare-earth doped (Sr2−xSmx)FeMoO6 compounds

Structural and electromagnetic properties driven by oxygen vacancy in Sr2FeMoO6−δ double perovskite

“…T C z 420 K for Sr 2 FeMoO 6 compound with 10% ASD concentration, while T C decreases to 400 K when ASD concentration increases to 20%. In our case, the T C is 418 K for A compound (10.73% ASD concentration), which is comparable with above results [17,30,31]. However, T C of B compound (21.13% ASD concentration) decreases to 367 K, which is much lower than the reported 400 K (20% ASD concentration of Sr 2 FeMoO 6 ) [17].…”

Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr(2−y)NayFe(1−x)Mo(1+x)O6 (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)

“…[15][16][17][18][19][20][21] Actually, the ferromagnetic T C of A 2 FeMoO 6 (A: Ca/Ba/Sr) can indeed be signicantly enhanced by substituting the divalent A 2+ ions with the trivalent ions (such as La 3+ , Nd 3+ , Sm 3+ etc.). 15,17,19,[22][23][24][25][26][27] A substantial increase in the ferromagnetic T C is because of the increase in the carrier density caused by electron injection into the conduction band. However, recent investigation has shown that the ferromagnetic state of La x -Sr 2Àx FeMoO 6 becomes unstable, and the T C will decrease when too many electrons are doped in the conduction band (x > 1).…”

“…21,31,33,34 Experimentally, there are mainly three methods to modify the carrier density and further probe the corresponding physical properties of SFMO: the rst method is to completely substitute Fe or Mo with other elements; the second method is carrier doping that is achieved by partially replacing Sr 2+ with trivalent ions (such as La 3+ , Nd 3+ , Sm 3+ etc.) or univalent ions (such as K + and Na + ); 15,19,26,33,35 and the third method is to tune the ratio of Fe/Mo. 31,36 Among the above mentioned three methods, although the rst method is benecial for exploring new double perovskites, it will destroy the intrinsic physical properties to some extent: for example, the ferromagnetic behavior and halfmetal property in Sr 2 FeWO 6 will disappear, 37 the T C of Sr 2 -FeOsO 6 will have a low value of ca.…”

Effect of the itinerant electron density on the magnetization and Curie temperature of Sr2FeMoO6 ceramics

“…For improved T C can be observed due to the increased electron density caused by electron injection into the conduction band. 9,16,[18][19][20][21][22][23][24] Contrary to the T C response, the Fe/Mo ordering degree, saturated magnetization and magnetoresistance are reduced. 9,18,21,25,26 However, reports of the effect of hole-doping on the carrier density and the physical properties are relatively rare.…”