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The valence state of Yb ions in beta-YbAlB4 and its polymorph alpha-YbAlB4has been investigated by using X-ray absorption and emission spectroscopy inSPring-8 at temperatures from 2 to 280 K. The observed Yb valence is 2.78 +-0.01 in beta-YbAlB4 at 2 K by using the X-ray emission spectroscopy. Thevalence is found to gradually increase with increasing temperature toward thetrivalent state, and the characteristic temperature of the valence fluctuationis expected to be about 290 K. We also found a small increase in the Yb valence(~0.002) by applying a magnetic field of 32 T at 40 K to beta-YbAlB4.

Synchrotron X-ray Spectroscopy Study on the Valence State in alpha- and beta-YbAlB4 at Low Temperatures and High Magnetic Fields