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A cage compound AxV2Al20 (Al10V), that was called an Einstein solid by Caplinand coworkers 40 years ago, is revisited to investigate the low-energy, localvibrations of the A atoms and their influence on the electronic andsuperconducting properties of the compound. Polycrystalline samples with A =Al, Ga, Y, and La are studied through resistivity and heat capacitymeasurements. Weak-coupling BCS superconductivity is observed below Tc = 1.49,1.66, and 0.69 K for Ax = Al0.3, Ga0.2, and Y, respectively, but not above 0.4K for Ax = La. Low-energy modes are detected only for A = Al and Ga, which areapproximately described by the Einstein model with Einstein temperatures of 24and 8 K, respectively. A weak but significant coupling between the low-energymodes, which are almost identical to those called rattling in recent study, andconduction electrons manifests itself as anomalous enhancement in resistivityat around low temperatures corresponding to the Einstein temperatures.

Superconductivity in an Einstein Solid AxV2Al20 (A = Al and Ga)