Abstract

The structural phase transition in single crystalline DyB 6 has been studied by the thermal expansion measurements under high pressure up to 2.2 GPa. It is found that the temperature dependence of the linear thermal expansion, Δ L/ L, along [1 1 1]-axis shows very sharp and large change at 30 K (=T ∗) compared with those along other axes at ambient pressure, indicating the structural phase transition from cubic to rhombohedral phase caused by the cooperative Jahn–Teller effect. By applying pressure, the large change in Δ L/ L at T ∗ becomes broader, and T ∗ shifts to high temperature.

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