We report a direct observation of a 90° reorientation of Yb spins in YbFeO3 by Mössbauer spectroscopy of single crystals. Our spectra are consistent with a continuous rotation of the Yb spins in the region 6.6 K?T?7.8 K with second‐order phase transitions at the end points. Our results agree with qualitative predictions by Horner and Varma and by Yamaguchi, but the quantitative predictions of Yamaguchi are found not to apply to YbFeO3.

Topics
Phase transitions, Mossbauer spectroscopy
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© 1975 American Institute of Physics.
1975
American Institute of Physics
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