Local Non-Fermi-Liquid Anomaly and Inter-Site Effects of 5f Electron Systems

Single-U-ion properties of heavy-electron compound URu-D22Si-D2have been investigated by a series of diluting experiments on R-D21-x-D2U-D2Ru-D2Si-D22（R=Y， Th; x [less than or equal] 0.07）。一个强大的、不寻常的磁性异源性的地方5 f时刻通常可以观察到通过干扰。From a large enhancement of·and C/T at T → 0， we sugggest a non-Kramers， magnetic doublet·イD25·エD2 （fイイD12·エD1） to be eminently suitable for the crystal-field lowest level， contrary to general views of low-lying singlets for the periodic system。我们进一步确认了传统的缺失在所有这些方言中的影响。在低温度下，5 f时刻的强烈抑制在ρ中的非琐事lnT降解和磁性入口中的微小变化。磁场中的特殊热量测量达到12个T揭示了没有固定入口的迹象，并将两通道Kondo理论的简单应用用于现有合金。We have also found through neutron-scManagement ing experiments that the periodic system URu-D22-D2undergoes a new phase transition under high pr #。

Single-U-ion properties of heavy-electron compound URuィイD22ィエD2SiィイD22ィエD2 have been investigated by a series of diluting experiments on RィイD21-xィエD2UィイD2xィエD2RuィイD22ィエD2SiィイD22ィエD2(R=Y, Th; x 【less than or equal】0.07). A strong uniaxial magnetic anisotropy of local 5f moments is commonly observed throughout the dilutions. From a large enhancement of Χ and C/T at T → 0, we suggest a non-Kramers, magnetic doublet ΓィイD25ィエD2 (fィイD12ィエD1) to be eminently suitable for the crystal-field lowest level, contrary to general views of low-lying singlets for the periodic system. We have further confirmed absence of the conventional Kondo effect in all these dilutions. A strong suppression of 5f moments at low temperatures accompanies a non-trivial lnT decrease in ρ and a small change in the magnetic entropy. Specific-heat measurements in magnetic fields up to 12 T have revealed no sign of the residual entropy, eliminating the simple application of the two-channel Kondo theory to the present alloys. We have also found through neutron-scattering experiments that the periodic system URuィイD22ィエD2SiィイD22ィエD2 undergoes a new phase transition under high pressure.