T. Omi

Magnetic Properties of a Heavy Fermion Substance CeInCu2 with a Cubic Structure

We have grown a single crystal of CeInCu 2 and have confirmed that it is the first known heavy fermion substance with a cubic structure in Ce compounds. The specific heat coefficient is about 1.2 J/mol·K 2 below 1 K.

Anomalous Hall Coefficient in the f Electron system– Ce Compounds

We report the temperature dependence of Hall coefficient of RCu 6 (R: La, Ce, Pr, Nd and Sm), Ce x La 1- x Cu 6 and typical Ce compounds (CeRu 2 , CeSn 3 , CePd 3 , CeCu 2 Si 2 , CeAl 3 , CeInCu 2 , CeAl 2 , CeIn 3 and CeB 6 ) in the temperature range of 0.7 K to room temperature. The f electrons of these substances show a wide variety of behavior including Pauli itinerance, mixed valence, heavy fermion and localized moment system. These characteristics are well reflected in the Hall coefficient. The Hall coefficient of Ce x La 1- x Cu 6 at higher temperatures than 30 K is well fitted by the recent skew scattering Hall effect theory.

Transport Property and de Haas-van Alphen Effect in YCu2

We have measured the electrical resistivity, Hall coefficient, magnetoresistance and de Haas-van Alphen effect in YCu 2 . This substance is found to be a compensated metal with equal carrier concentration of electrons and holes. Fermi surface is found to be a multiply connected one constructed by many cylindrical arms. Open orbits exist along the b - and c -axes.

Normal and superconducting properties of the magnetic superconductor URu2Si2

Disappearance of the paramagnetic Fermi surface in URu2Si2 due to the formation of spin density waves is well reflected in the electrical resistivity, Hall coefficient, thermoelectric power and magnetic susceptibility. Pressure dependences of the Neel temperature, superconducting transition temperature and superconducting upper critical field are also investigated.

Fermi surface and cyclotron mass in RB6 and RCu6

Abstract The de Haas-van Alphen effects and transport properties in RB 6 and RCu 6 are presented.

Anomalous Hall Effect in Heavy Fermion Substances

The Hall coefficient of the heavy fermion compounds CePd3, CeCu2Si2, CeAl3, CeCu6, URu2Si2 and UCu5 manifests an extremely large positive value due to skew scattering by Kondo sites. The Hall coefficient increases with decreasing temperature, making a maximum and decreases steeply. At low temperatures it becomes constant, suggesting a band of heavy electrons.