Magnetic properties of two- and three-dimensional materials, id est large-area graphene and single crystals, respectively, of VB2 and MnB2, are studied at low temperatures and in high magnetic fields by torque magnetometry. Magnetic quantum oscillations are not observed for five differing graphene samples, consistent with sample quality available to date. Single crystals of VB2 and MnB2 of large size and unprecedented crystalline quality exhibit a pronounced de Haas-van Alphen effect. We report the angular and temperature dependencies of two de Haas-van Alphen frequencies for each crystal. They allow us to make a detailed comparison with band structure calculations and the isostructural compounds CrB2 and MgB2.
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Magnetic properties of two- and three-dimensional materials, id est large-area graphene and single crystals, respectively, of VB2 and MnB2, are studied at low temperatures and in high magnetic fields by torque magnetometry. Magnetic quantum oscillations are not observed for five differing graphene samples, consistent with sample quality available to date. Single crystals of VB2 and MnB2 of large size and unprecedented crystalline quality exhibit a pronounced de Haas-van Alphen effect. We report...
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