Low-temperature magnetisation process in the cubic pyrochlore quantum antiferromagnet, Er2Ti2O7

摘要

We report low-temperature susceptibility and magnetisation data for the cubicpyrochlore Er2Ti2O7. By performing the measurements on single crystals we areable to establish the degree of magnetic anisotropy present in this compoundand to determine the critical values for magnetic field induced transitionsbelow the magnetic ordering temperature of 1.2 K. We also present a magneticH-T phase diagram of this quantum XY antiferromagnet for different directionsof an applied field.