特集：高圧力が織りなす4f電子の世界
高圧力下におけるYbPdの価数秩序の崩壊と量子価数揺らぎの誘起
キーワード:
Yb compound,
valence order,
valence fluctuation,
quantum critical behavior,
diamond anvil cell,
cubic anvil cell
2022 年 32 巻 1 号 p. 20-26
詳細
2022 年 32 巻 1 号 p. 20-26
To clarify a high-pressure cubic valence fluctuating ground state of YbPd appearing after collapse of valence order, powder X-ray diffraction and electrical resistivity under high pressures were measured at low temperatures. Tracing splitting of a (4 0 0) Bragg peak manifests that the structural phase transition into a tetragonal symmetry is shifted linearly to 20 K at P = 4.4 GPa and is suppressed at P = 5.0 GPa. The resistivity measurements reveal non-Fermi liquid
(NFL) behavior and no emergence of new magnetic order. The resistivity exhibits T-linear dependence above 8 GPa, which corresponds to quantum valence fluctuation.
