Large magnetoresistance in double perovskite Sr2Cr1.2Mo0.8O6-δ

B-site ordered perovskite LaSrMnNbO6: Synthesis, structure and antiferromagnetism

“…Since the A-feature intensity is proportional to the number of 4d holes in the t 2g orbital a decreasing Nb valence (increasing 4d-electron count) would also lead to a decrease in the A-feature intensity. Such an A-feature degradation and chemical shift has been reported in multiple Mo-based compounds [14][15][16]19] and Ru compounds [13]. For the case of the LaSrMnNbO 6 compound the higher intensity of the A-feature, relative to the B-feature, and chemical shift place its valence clearly in the Nb 5+ range.…”

“…The two perovskite based Nb 5+ compounds display a robust, resolved twopeak structure with the lower energy peak (A) involving transitions into 4d-t 2g final states; and the high-energy peak (B) involving excitations into 4d-e g states. The Nb 5+ case is similar to Mo 6 + compounds studied by our group in the past, where the 4d orbitals are empty [14][15][16]19]. As in the case of Mn, discussed above, a decreasing Nb valence (increasing 4d-electron count) would lead to a chemical shift of the absorption edge to lower energy.…”

“…The intense peak features at the L 3 -edges of 4d transition metals involve 2p-core to 4d final-state transitions [13][14][15][16][17][18][19]. These features can provide a probe of the empty 4d state energy distribution, albeit modified by the transition matrix element, core-hole interaction and multiplet effects [13][14][15][16][17][18][19].…”

“…These features can provide a probe of the empty 4d state energy distribution, albeit modified by the transition matrix element, core-hole interaction and multiplet effects [13][14][15][16][17][18][19]. In the top of Fig.…”

Large effects ofA-site average cation size on the properties of the double perovskitesBa2−xSrxPopov1, Greenblatt2, Croft3 2003Phys. Rev. B1079572View full textAdd to dashboardCite

“…1͒ sparked interest in ferrimagnetic double perovskites. [2][3][4][5][6] The structure of A 2 BЈBЉO 6 double perovskites is similar to that of simple perovskites, ABO 3 , except that the BЈ and BЉ ions can order with a concomitant doubling of the unit cell; the ordered structure is manifested by the appearance of superstructure peaks in the powder x-ray diffraction ͑PXD͒ pattern.…”