MAGNETIC AND SUPERCONDUCTING PHASE-DIAGRAMS OF SINGLE-CRYSTAL HONI2B2C

In plane measurements of resistivity and magnetic properties are repor ted for HoNi2B2C. The superconducting transition as well as several ma gnetic phase transitions are observed with measurements of R(T,H), M(T ,H), and chi(T,H). Three magnetic transitions occur below the supercon ducting transition temperature of 8 K. Two of these are field dependen t while the other is relatively field independent. Phase diagrams cons tructed from the different measuring techniques will be discussed for the in-plane, [100] and [110], directions of the magnetic field and th e out-of-plane, [001], direction.