The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10

The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 401; pp. 217 - 222
Main Authors Sofronova, S.N., Bezmaternykh, L.N., Eremin, E.V., Nazarenko, I.I., Volkov, N.V., Kartashev, A.V., Moshkina, E.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2016
Subjects
Exchange interactions
Ferrimagnetic
Heat capacity
Ludwigites
Magnetic order
Heat capacity
Ludwigites
Ferrimagnetic
Magnetic order
Exchange interactions
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Summary:The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. •The single crystals of Ni5Ge(BO5)2 with a ludwigite structure were grown.•Magnetic and the specific heat measurements were performed.•The calculation of the exchange interactions shows a competition between interactions.•The magnetic behaviour corresponds to ions moments part freezing or spin-glass state.•We propose two models of magnetic ordering in Ni5Ge(BO5)2.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2015.10.024