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Structural phase transition accompanying with quadrupolar ordering in DyB4with Shastry-Sutherland type geometrical frustration has been studied by X-raydiffraction. Previous study [D. Okuyama et al.: J. Phys. Soc. Jpn. 74 (2005)2434.] using resonant X-ray scattering revealed short-range ordering of theOzx-type quadrupolar moments and the c-plane component of the magnetic momentsin addition to long-range ordering of the c-axis component of the magneticmoments. The present report focuses on the lattice distortion below thequadrupolar ordering temperature at TN2=12.7 K. The (0 0 l=integer) fundamentallattice reflection splits into four peaks along the h and k directions and the(h=even 0 0) reflection becomes broad along the l direction. This indicatesthat a structural transition from tetragonal to monoclinic takes place belowTN2 together with the ordering of the quadrupolar moments.

Quadrupolar Order and Structural Phase Transition in DyB4 with Geometrical Frustration