Neutron powder diffraction study (T= 4.2-300 K) and polarization analysis of YBaCuFeO5+
A W Mombrú1,2, K Prassides2, C Christides2,3
1Laboratorio de Cristalografía, Cátedra de Física, Facultad de Química, PO Box 1157, CP 11800, Montevideo, Uruguay.
Abstract:
The crystal and magnetic structures of the perovskite YBaCuFeO5+δhave been studied in the temperature rangeT = 4.2-300 K by powder neutron diffraction. In addition to the antiferromagnetic ordering transition atT = 442 K, a commensurate-incommensurate magnetic transition is detected atT' = 190 K. Below this temperature, two sets of satellite peaks surround the (1/2,1/2,1/2) magnetic peak atd ∼ Å, collapsing into a single set of satellites below 155 K. Polarization analysis has been performed to confirm the magnetic nature of the (1/2,1/2,1/2)±satellites.
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