Crystal structure and magnetism of the double perovskites A2FeReO6 (A=Ca, Sr, Ba)

Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites

“…The latter also displays higher Curie temperature (T c = 540 K) and coercivity (H c = 9 kOe) indicative of stronger exchange interactions and larger magnetic anisotropy in the distorted crystal structure. The monoclinic structure of Ca 2 FeReO 6 (CFRO) features rotations of FeO 6 and ReO 6 octahedra around b-and c-axes resulting in large deviation in Fe-O-Re bonding angle away from 180 • (to 156 • ) 32,47,48 . These rotations decrease the pdπ hopping that dominates transport in the unrotated structure leading to the observed insulating behavior 2,47,49 .…”

Sr2Fe1+xRe1−xO6 double perovskites: magnetoresistance and (magneto)thermopower

“…Among the double perovskites, ferrimagnetic Sr 3 Fe 2 ReO 9 attracted our attention [15]. Indeed, as this compound crystallizes in the I4/m space group, with a≈5.67Å and c≈7.90Å, that is characteristic of Ae 2 FeMO 6 double perovskites, its formula must be written as Sr [16]. In the Sr 2 Fe 1+x Re 1-x O 6 series, the degree of cationic ordering (the distribution of Fe and Re on 2a and 2b Wyckoff sites) has an effect on the magnetic properties, whatever x [17][18][19][20].…”

“…The structural properties were checked by RT XRPD with a PAN-analytical diffractometer (CoK α radiations). The crystallographic structures were refined in the I4/m space group of the double perovskite Ae 2 MM'O 6 structure [16] using the Fullprof program [21]. Since scattering factors for Re and Fe are quite different, occupation of the metal 2a and 2b Wyckoff sites were refined.…”

First-Principles Study of Double Perovskite Sr2FeXO6 (X = Mo, Re) Ultrathin Films and Heterostructures

“…The structural, electronic, and magnetic properties of the bulk double perovskites have been studied extensively. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] At the same time, experimental studies of the double-perovskite films have been performed; [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55] in most of these studies, a SrTiO 3 (STO) substrate was used for thin-film growth.…”