J. Phys. Soc. Jpn. 81, 123702 (2012) [4 Pages]
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Received August 25, 2012; Accepted October 22, 2012; Published November 15, 2012
We find anomalously large diamagnetic responses in the cage compounds AV 2 Al 20 where A=Y and La, not A=Al 0.3 , Sc 0.4 , and Lu, despite the apparent similarities in crystal and electronic structures among these compounds. The magnetic susceptibilities of the Y and La compounds become -1.94×10 -4 and -7.44×10 -4 cm 3 mol -1 at 10 K, respectively, the latter of which corresponds to approximately one-quarter of that of bismuth, a well-known diamagnetic material, in terms of unit volume. The origin is not clear but may be related to a specific evolution in the band structure, as the diamagnetic response increases with increasing lattice constant.
©2012 The Physical Society of Japan
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