1991 年 60 巻 4 号 p. 1173-1175
Ultrasonic measurements have been made between 2 K and 200 K for quasicrystalline Al6Li4Cu. The temperature dependence of the ultrasonic velocity shows an anomalous decrease below 50 K with decreasing temperature. This anomaly is explained well by the existence of two-level systems without distribution of energy splittings.
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