Magnetic properties of Nd1/3Sr2/3FeO3 by neutron and Mossbauer spectroscopy

Charge transfer type Nd1/3Sr2/3FeO3 was synthesized and its magnetic proper ties were investigated by neutron diffraction and Mossbauer spectroscopy at various temperatures ranging from 4.2 K to room temperature. The powder ne utron diffraction shows magnetic ordering structures. The Nd1/3Sr2/3FeO3 wi th small lattice distortion underwent a charge ordering (CO) phase transiti on at and below T-CO = 163 K corresponding to a sequence of Fe+3Fe+3Fe+5Fe3Fe+3Fe+5 aligned along the z direction of rhombohedral, as well as canted antiferromagnetic spin ordering. The spin rotation resulting from helical s pin of Nd was observed at and below 25 K. At 4.2 K, the electric quadrupole splittings for Fe3+ and Fe5+ are 0.06 and 0.15 (mm/s) which were changed t o -0.06 and -0.02 (mm/s) at and above 20 K. It is evidence of spin rotation in Nd1/3Sr2/3FeO3. (C) 2001 American Institute of Physics.