High pressure studies of magnetic, electronic, and local structure properties in the rare-earth orthoferrites RFeO3 (R = Nd, Lu)

The high pressure modification of the electronic structure, magnetic proper ties, and local crystal structure have been studied in the rare-earth RFeO3 (R=Nd, Lu) orthoferrites in both pure single crystals and polycrystalline samples doped with Sn. The pressure dependences of the unit cell parameters , Neel temperatures, supertransferred hyperfine magnetic fields at tin nucl ei H-Sn, and the optical absorption edge have been obtained. The relations of the obtained values with the geometry of exchange interactions were anal yzed.