IFIS - LITORAL   24734
INSTITUTO DE FISICA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Spin reorientation, magnetization reversal, and negative thermal expansion observed in RFe0.5Cr0.5O3 perovskites (R =Lu,Yb,Tm).
Autor/es:
FERNANDO POMIRO; ANTOINE MAIGNAN; RODOLFO D. SANCHEZ; CHRISTIN MARTIN; GABRIEL CUELLO; RAUL E. CARBONIO
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2016 vol. 94 p. 134402 - 135410
ISSN:
1098-0121
Resumen:
Three members of the perovskite family RFe0.5Cr0.5O3 (R =Lu,Yb, and Tm) have been synthesized and characterized. A systematic study of the crystal and magnetic structures was performed by neutron powder diffraction combined with magnetization measurements. All these compounds crystallize in a Pbnm orthorhombic unit cell and they are already antiferromagnetic at room temperature. The study of the magnetic structure vs temperature showed the occurrence of a progressive spin reorientation from TM 4 to TM 2 for the transition metal sublattice, and in the Tm-based sample, a long-range magnetic order of the Tm3+ sublattice was found (R 8 ). These results are in excellent agreement with the magnetic susceptibility measurements. No spin reorientation is observed in the Lu based sample for which a magnetization reversal at acompensation temperature Tcomp =225K was detected. A clear magnetostrictive effect was observed in the samples with R = Yb and Tm associated with a negative thermal expansion and was assigned to a magnetoelastic effect produced by repulsion between the magnetic moments of neighboring transition metal ions.