Observation of low-temperature specific-heat anomaly in CuZrAl bulk metallic glasses

Low-temperature specific heat and ultrasonic experiments on CuZrAl bulk metallic glass (BMG) are performed. The low-temperature specific-heat anomaly arising from the low-frequency vibrations responsible for the boson peak, which is correlated with the nature and physical properties of the glasses, is clearly observed in the BMG. The ratio of the excess specific heat to the Debye contribution around the maximum is 1.93 for the BMG.