Structure, magnetic and thermodynamic properties of heterometallic ludwigites: Cu2GaBO5 and Cu2AlBO5
| Autor: | I.F. Gilmutdinov, R. M. Eremina, R.G. Batulin, Vadim Grinenko, V.V. Gurzhiy, T.P. Gavrilova, E. M. Moshkina, Dmytro S. Inosov |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Condensed Matter - Materials Science Materials science Strongly Correlated Electrons (cond-mat.str-el) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Crystal structure Atmospheric temperature range engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Magnetic susceptibility Electronic Optical and Magnetic Materials Magnetic field Magnetization Paramagnetism Crystallography Condensed Matter - Strongly Correlated Electrons 0103 physical sciences engineering Antiferromagnetism 0210 nano-technology Ludwigite |
| Popis: | We present an extensive study of the structural, magnetic and thermodynamic properties of high-quality monocrystals of two heterometallic oxyborates from the ludwigite family: Cu2GaBO5 and Cu2AlBO5 in the temperature range above 2 K. The distinctive feature of the investigated structures is the selective distribution of Cu and Ga/Al cations. The unit cell of Cu2GaBO5 and Cu2AlBO5 contains four nonequivalent crystallographic sites of metal ions. Two sites in the structure of Cu2GaBO5 are fully occupied by Cu atoms which form the quasi one-dimensional chains along the a-axis. For Cu2AlBO5 all sites are partially occupied by Al and Cu atoms. The joint analysis of low-temperature data on magnetic susceptibility and magnetic contribution to the specific heat showed that Cu2AlBO5 and Cu2GaBO5 exhibit an antiferromagnetic transition at T N = 2.4 and 4.1 K, respectively. The magnetic response below T N can be represented as the sum of two contributions: the ordered component and the paramagnetic contribution from defects of the same relative weight. It is shown that the external magnetic field above 2.5 T and 2.8 T for Cu2GaBO5 and Cu2AlBO5, respectively, leads to a broadening of the magnetic phase transition indicating suppression of the long-range antiferromagnetic order. |
| Databáze: | OpenAIRE |
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