High-pressure studies of DyBC

DyBC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 DyBC showing both of the antiferroquadrupolar (AFQ) and antiferromagnetic (AFM) orders. The Nel temperature increases gradually with increasing pressure and saturates above 5.2 GPa while the AFQ transition temperature decreases almost monotonically up to 3.13 GPa and seems to merge with at around 6-7 GPa. These results indicate that the application of pressure suppresses the AFQ ordering in DyBC and simultaneously enhances the AFM interaction between 4 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.