Thermal expansion of single-crystalline HoNi2B2C


Thermal expansion of single-crystalline HoNi2B2C

Schneider, M.; Gladun, A.; Kreyssig, A.; Wosnitza, J.; Souptel, D.; Behr, G.

The thermal expansion a has been measured for single-crystalline HoNi2B2C in the range between 2 and 200 K. At low temperatures, a is dominated by magnetic contributions leading to a strongly anisotropic behaviour with different signs for the expansion coefficients near the antiferromagnetic phase transition. Analysing the magnetic and lattice contributions of a well above this temperature, a nearly isotropic behaviour of the latter one can be deduced. Using the Ehrenfest relation, a relatively weak pressure dependence of the superconducting transition temperature of dTc=dp ¼ 0:1K=GPa was determined for pressure applied along the c direction which points to a rather small pressure-induced lattice stiffening. The ratio between expansion coefficient and specific-heat features large values at the onset of magnetic order.

  • Journal of Magnetism and Magnetic Materials 311(2007), 489-493

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Publ.-Id: 9564