Antiferromagnetic ordering of the magnetic superconductor TmNi2B2C
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We used a capacitive dilatometer to measure the thermal expansivity of the magnetic superconductor TmNi2B2C along the c-axis and a-axis. We studied the antiferromagnetic phase transition, and found the ordering temperature of the material to be TN=1.5K. We will compare our results to those in the literature.