Abstract
Elastic properties of CeCo 2 single crystals have been investigated. It has been found that CeCo 2 shows a remarkable elastic softening in c 44 and ( c 11– c 12)/2. The elastic anomaly suggests a very narrow band of 149 K. Acoustic quantum oscillation has been successfully observed in CeCo 2. The measurement by using 3He– 4He dilution refrigerator gave us the effective mass of κ-orbit. The quantum oscillation frequency and the value of the effective mass are 193 T and 1.17 m 0, and 232 T and 1.73 m 0 for the magnetic field directions parallel to [1 0 0] and [1 1 0], respectively.
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