Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study
Evgeniya Moshkina, Clemens Ritter, Evgeniy Eremin, Svetlana Sofronova,, Andrey Kartashev, Andrey Dubrovskiy, Leonard Bezmaternykh
TL;DR
This study investigates the magnetic structure and properties of Cu2MnBO5 ludwigite, revealing a ferrimagnetic phase transition at 92 K, with detailed insights into magnetic moments, disorder, and field-dependent transitions.
Contribution
It provides a comprehensive analysis of the magnetic structure, moments, and phase transition of Cu2MnBO5 using thermodynamic, magnetic, and neutron diffraction data.
Findings
Magnetic phase transition at 92 K to a ferrimagnetic phase
Partial disordering of copper magnetic moments
Field-dependent transitions below the phase transition temperature
Abstract
We report on the thermodynamic, magnetic properties and the magnetic structure of ludwigite-type Cu2MnBO5. The specific heat, the low-field magnetization and the paramagnetic susceptibility were studied on a single crystal and combined with powder neutron diffraction data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal a single magnetic phase transition at T=92 K, which corresponds to the magnetic ordering into a ferromagnetic phase. The cation distribution and the values and directions of magnetic moments of ions in different crystallographic sites are established. The magnetic moments of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are pairwise antiparallel and their directions do not coincide with the directions of the principal crystallographic axes.The small value of the magnetic moment of copper ions…
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