Abstract
The influence of thermal treatment on the superconducting properties of the quaternary compound HoNi 2B 2C and its correlation to the volume of the unit cell is investigated by X-ray diffractometry and ac-susceptibility measurements. Our results reveal that the annealing process carried out on are-melted intermetallic samples of HoNi 2B 2C strongly influences the interplay between superconductivity and magnetism in this compound. The re-entrant behaviour, observed for polycrystalline HoNi 2B 2C samples annealed at 1100°C for 4 days, can be transformed into pure-superconducting behaviour by subsequent annealing at 800°C for 10 days and vice versa. The results can be explained by mutual substitution of atoms on lattice sites which varies the degree of the long-range crystallographic order. Partially irreversible behaviour can be attributed to the formation of vacancies on lattice sites.
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