Transport and magnetic measurements on single crystal rare earth-nickel-borocarbides

RNi(2)B(2)C (R=Y, Lu-Gd) intermetallics show diverse behavior, including moderately high temperature superconductivity (R=Y, Lu), coexistence of superconductivity with magnetic order (R=Tm-Dy), only magnetic order (R=Tb, Gd), and heavy fermion behavior without superconductivity or magnetic order (R=Yb). The large energy scale of the crystal electric field splitting of lanthanide orbitals leads to large anisotropies in the magnetic and superconducting properties of many of these compounds. Single crystal transport measurements can help determine the influence of anisotropy on magnetic and superconducting phase boundaries as illustrated by the phase diagram for HoNi2B2C determined by transport and magnetic measurements and delineate the important scattering mechanisms by resistivity and thermopower measurements across the series.*