Tomoyuki Kumagai

Elastic Anomalies of Polycrystalline SmRu4P12 Associated with Metal–Insulator Transition

The longitudinal and transverse elastic constants of polycrystalline SmRu 4 P 12 have been measured as a function of temperature in the magnetic field up to 12 T. 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 = 16 K. 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 4 P 12 have been clearly observed by ultrasonic measurements. An elastic anomaly was found at T * , which is 14 K 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.

Elastic properties of the non-Fermi-liquid metal CeRu4Sb12 and dense Kondo semiconductor CeOs4Sb12

We have investigated the elastic properties of the Ce-based filled skutterudite antimonides CeRu

Elastic properties of Re-Ru4Sb12 (Re; La, Pr)

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Steplike lattice deformation of single crystalline (La0.4Pr0.6)1.2Sr1.8Mn2O7 bilayered manganite.

Sb

Anomalous pressure effect on the remanent lattice striction of a (La,Pr)1.2Sr1.8Mn2O7 bilayered manganite single crystal

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Ultrasonic study of the filled skutterudite compound Pr1-xLaxFe4P12 (x = 0.05 and 0.15)

and CeOs

Elastic properties of the filled skutterudite compoundNdFe4P12

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Elastic anomalies of single crystalline SmRu4P12 near metal–insulator transition

Sb

Coupling between conduction electrons and elastic waves in PrOs4Sb12

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Coupling between conduction electrons and elastic waves in

by means of ultrasonic measurements. CeRu