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Title

Investigation of magnetic structure and phase transitions in Co311B7O13Br boracite by neutron diffraction

Authors
Schobinger-Papamantellos, Penelope
Fischer, P.
Published in Ferroelectrics. 1994, vol. 162, no. 1-4, p. 93-101
Abstract Neutron diffraction studies of orthorhombic Co311B7O13Br at 293 K and in the temp. range 1.5-30 K reveal a two step onset of magnetic ordering, starting at the 2nd order transition to a weakly ferromagnetic phase at TN = 17.5 K (Neel type) and followed at about T1 = 10.5 K, by a smooth transformation to a three-dimensional canted magnetic structure (magnetic space group Pc'a21' (Sh29101), magnetic modes Cx(++--), Fy(++++), Az(+--+)). The three Co sites display completely different moment values and directions, arising from frustration effects assocd. with the formation of isolated Co3Br groups with a triangular arrangement of the three Co sites.
Keywords BozaciteNeutron diffractionMagnetic structureFerroelectricFerromagneticFerroelastic
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Structures
Project FNS: 1993
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SCHOBINGER-PAPAMANTELLOS, Penelope et al. Investigation of magnetic structure and phase transitions in Co311B7O13Br boracite by neutron diffraction. In: Ferroelectrics, 1994, vol. 162, n° 1-4, p. 93-101. https://archive-ouverte.unige.ch/unige:31340

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Deposited on : 2013-11-26

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