Thermal expansion of single-crystalline HoNi2B2C

摘要: Abstract The thermal expansion α has been measured for single-crystalline HoNi2B2C in the range between 2 and 200 K . At low temperatures, is dominated by magnetic contributions leading to a strongly anisotropic behaviour with different signs coefficients near antiferromagnetic phase transition. Analysing lattice of well above this temperature, nearly isotropic latter one can be deduced. Using Ehrenfest relation, relatively weak pressure dependence superconducting transition temperature d T c / p = 0.1 GPa was determined applied along direction which points rather small pressure-induced stiffening. ratio coefficient specific-heat features large values at onset order.