Effect of pressure on the antiferromagnetism and superconductivity of ErNi2B2C

The electrical resistivity of single crystalline ErNi2B2C has been measured at high pressures up to 2.2 GPa and magnetic fields up to 5 T in order to make clear the relation between antiferromagnetism and superconductivity. It is found that the superconducting transition temperature Tc is almost independent of pressure, while the upper critical field Hc2 for H⊥c decreases with increasing pressure. The Neel temperature TN increases with increasing pressure. The present results are compared with those of other borocarbides and discussed taking into account the interplay between the superconductivity and the antiferromagnetism.