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High-pressure studies of DyB$$_2$$C$$_2$$

DyB$$_2$$C$$_2$$の高圧物性研究

山内 宏樹; 長壁 豊隆; 小坂 昌史*; 松岡 英一*; 小野寺 秀也*

Yamauchi, Hiroki; Osakabe, Toyotaka; Kosaka, Masashi*; Matsuoka, Eiichi*; Onodera, Hideya*

We performed single-crystal neutron diffraction experiments and electrical resistivity measurements under high pressure on DyB$$_2$$C$$_2$$ showing both of the antiferroquadrupolar (AFQ) and antiferromagnetic (AFM) orders. The N$'e$el temperature $$T_N$$ increases gradually with increasing pressure and saturates above 5.2 GPa while the AFQ transition temperature $$T_Q$$ decreases almost monotonically up to 3.13 GPa and seems to merge with $$T_N$$ at around 6-7 GPa. These results indicate that the application of pressure suppresses the AFQ ordering in DyB$$_2$$C$$_2$$ and simultaneously enhances the AFM interaction between 4$$f$$ spins. The suppression of the AFQ ordering can be interpreted as being due to the restriction of the local strain associated with the AFQ transition by applying pressure.

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パーセンタイル:86.51

分野:Physics, Multidisciplinary

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