Anisotropic thermal expansion and magnetostriction of YNi2B2C single crystals

We present results of anisotropic thermal expansion and low temperature magnetostriction measurements on YNi2B2C single crystals grown by high temperature flux and floating zone techniques. Quantum oscillations of magnetostriction were observed at low temperatures for H vertical bar vertical bar c starting at fields significantly below H-c2(H < 0.7H(c2)). Large irreversible, longitudinal magnetostriction was seen in both in-plane and along the c axis directions of the applied magnetic field in the mixed superconducting state. Anisotropic uniaxial pressure dependences of T-c were evaluated using results of zero field, thermal expansion measurements.