Effect of band-filling and structural distortions on the Curie temperature of Fe-Mo double perovkites

Abstract

By means of high resolution neutron powder diffraction at low temperature we have characterized the structural details of $\mathrm{L}{\mathrm{a}}_{\mathrm{x}}\mathrm{S}{\mathrm{r}}_{2-\mathrm{x}}\mathrm{FeMo}{\mathrm{O}}_6$ ($0\le \mathrm{x}\le 0.5$) and $\mathrm{C}{\mathrm{a}}_{\mathrm{x}}\mathrm{S}{\mathrm{r}}_{2-\mathrm{x}}\mathrm{FeMo}{\mathrm{O}}_6$ ($0\le \mathrm{x}\le 0.6$) series of compounds. This study reveals a similar variation of the mean bond-angle \FeOMo in both series. In contrast, the mean bond-distance \FeMoO\ increases with La but not with Ca substitution. Both series also present a different evolution of the Curie temperature ($T_C$), which raises in the La series and slightly decreases in the Ca one. We thus conclude that the enhancement of $T_C$ in the La series is due to the electron filling of the conduction band and a concomitant rising of the density of states at the Fermi level.

Revtex, 4 Journal pages, 2 figures, 1 table

References in corpus (4)

• On the origin of neutron magnetic scattering in anti-site disordered Sr2FeMoO6 double perovskites
• Electronic and Magnetic Structures of Sr2FeMoO6
• Evidence of strong antiferromagnetic coupling between localized and itinerant electrons in ferromagnetic Sr2FeMoO6
• Phase diagram and influence of defects in the double perovskites

Cited by in corpus (6)

• Evidence of Kinetic Energy Driven Antiferromagnetism in Double Perovskites : A First-principles Study
• Curie temperature enhancement of electron doped Sr${}_2$FeMoO${}_6$ perovskites studied by photoemission spectroscopy
• Mean field theory for double-perovskites
• Understanding ferromagnetism in Cr-based 3d-5d double perovskites
• Electronic self-doping of Mo-states in A2FeMoO6 (A=Ca, Sr and Ba) half-metallic ferromagnets - a Nuclear Magnetic Resonance study
• Orbital ordering and magnetic structures in $\LMFO$ and $\LWFO$ double perovskites