HoB4 exhibits a spontaneous lattice distortion to monoclinic symmetry below TN2 = 5.7 K due to ferroquadrupolar order, with 0.46 Å total distortion amplitude and 3.5×10^{-3} relative volume change, consistent with C44 softening.
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Spontaneous lattice distortion and crystal field effects in HoB4
HoB4 exhibits a spontaneous lattice distortion to monoclinic symmetry below TN2 = 5.7 K due to ferroquadrupolar order, with 0.46 Å total distortion amplitude and 3.5×10^{-3} relative volume change, consistent with C44 softening.