Abstract

We performed ultrasound velocity measurements in single-crystalline YNi2B2C (Tc = 15.6 K) in the vortex state. The elasticity of the flux line lattice was probed in temperature and magnetic-field dependence of the ultrasound velocities. Magnetic-field dependence of the ultrasound velocities revealed elastic anomalies due to a first-order 45° reorientation transition of the hexagonal flux line lattice, and a second-order hexagonal-to-square lattice transition of the flux line lattice.

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