Escanhoela Jr, C. A.
Souza-Neto, N. M.
van Veenendaal, M.
Total Authors: 10
 Escanhoela Jr, Jr., C. A., Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 - USA
 Ctr High Pressure Sci & Technol Adv Res HPSTAR, Shanghai 201203 - Peoples R China
 Carnegie Inst Sci, HPCAT, Argonne, IL 60439 - USA
 Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka - India
 Cent Electrochem Res Inst, Madras Unit, CSIR, Madras, Tamil Nadu - India
 Escanhoela Jr, Jr., C. A., Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
 Northern Illinois Univ, Dept Phys, De Kalb, IL 60115 - USA
Total Affiliations: 8
Physical Review B;
AUG 2 2018.
Web of Science Citations:
We studied the effect of physical pressure on the electronic and magnetic properties of ferrimagnetic double perovskites A(2)FeReO(6) (A = Ca, Ba) using Re L-2,L-3 edge x-ray absorption spectroscopy and powder diffraction measurements. Volume compression is shown to dramatically increase the magnetic coercivity (H-c) in polycrystalline samples of both compounds with Delta H-c/Delta V similar to 150-200 Oe/angstrom(3). A nearly eight-fold increase in H-c, from 0.2 to 1.55 T, is obtained in Ba2FeReO6 at P = 29 GPa. While no signs of structural phase transitions are seen in either sample to similar to 30 GPa, the structural data points to a pressure-driven increase in tetragonal distortion of ReO6 octahedra. A sizable but pressure-independent Re orbital-to-spin magnetic moment ratio is observed, pointing to the critical role of spin-orbit interactions at Re sites. We present a J(eff) description of the electronic structure that combines effects of crystal field and spin-orbit coupling on the Re 5d(2) orbitals and use this description to provide insight into the pressure-induced enhancement of magnetic anisotropy. (AU)