Anisotropic magnetic properties of single-crystalline HoNi2B2C at high magnetic fields and high pressure

Magnetostriction and magnetoresistance of single-crystalline HoNi2B2C have been measured at ambient pressure. A large anisotropy was found in the held dependence of these properties. The magnetoresistance was also measured at high pressure up to 2 GPa at low temperature below the superconducting tra nsition temperature (9 K). Several anomalies were found due to the metamagn etic transitions, in which the transition fields increased with increasing pressure. These results will be discussed from a thermodynamical point of v iew and compared with the anisotropy in the lattice compression. (C) 2001 E lsevier Science B.V. All rights reserved.