Abstract
We present the results of a study of the spontaneous strain accompanied by a ferroquadrupolar ordering in TmAu2. The strain has been investigated by means of thermal expansion, magnetostriction, and neutron diffraction measurements on a single crystalline TmAu2. In the ferroquadrupolar ordered phase, the strain shows a strong enhancement by applying magnetic field. This implies that structural orthorhombic domains caused by the ferroquadrupolar ordering are transformed into a single-domain structure by a magnetic field.
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