Elastic Anomalies of Polycrystalline SmRu_4P_<12> Associated with Metal-Insulator Transition (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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The longitudinal and transverse elastic constants of polycrystalline SmRu_4P_<12> have been measured as a function of temperature in the magnetic field up to 12T. The transverse elastic constant shows a weak softening toward low temperatures. Both longitudinal and transverse elastic constants show a large anomaly below the metal-insulator transition T_<MI> = 16K. These elastic anomalies indicate the ground state of the crystalline electric field multiplet to be Γ_8, and that the quadrupole ordering is responsible for this metal insulator transition. The successive anomalies of SmRu_4P_<12> have been clearly observed by ultrasonic measurements. An elastic anomaly was found at T^*, which is 14K in the absence of a magnetic field. T_<MI> increases and T^* decreases under the application of the magnetic field. The anomaly at T^* is markedly enhanced by the application of a magnetic field.
社団法人日本物理学会の論文
2004-02-15