Chie Tonohiro

Magnetic and Superconducting Properties of LaIrSi3and CeIrSi3with the Non-centrosymmetric Crystal Structure

Single crystals of LaIrSi 3 and CeIrSi 3 were grown by the Czochralski pulling method in a tetra-arc furnace and the magnetic and superconducting properties, together with superconductivity in CeIr 1- x Co x Si 3 , were clarified by measuring the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas–van Alphen (dHvA) effect. From the results of the dHvA experiment for LaIrSi 3 , the Fermi surface is found to split into two Fermi surfaces due to the spin–orbit interaction arising from the non-centrosymmetric crystal structure, which are separated by about 1000 K. Similar split Fermi surfaces are expected in the antiferromagnet CeIrSi 3 . The electronic state of CeIrSi 3 is tuned from the antiferromagnetic state to the superconducting state by applying pressure. The upper critical field H c2 (0) at a pressure of 2.65 GPa is found to be highly anisotropic: H c2 (0)=95 kOe for H ∥[110] and H c2 (0)≃300 kOe for H ∥[001], with the superconducting transition temperature T sc ≃...Single crystals of LaIrSi 3 and CeIrSi 3 were grown by the Czochralski pulling method in a tetra-arc furnace and the magnetic and superconducting properties, together with superconductivity in CeIr...

Magnetic Properties and Crystalline Electric Field Scheme in RRhIn5 (R: Rare Earth)

A series of ternary compounds RRhIn 5 (R: rare earth) has been grown in the single crystalline form by means of the flux method. The magnetic properties of these compounds were investigated by meas...

Electronic and Magnetic Properties of Rare Earth Compounds RPt2Ge2 (R: La–Ho)

We succeeded in growing the single crystals of RPt 2 Ge 2 (R: La–Ho) with the monoclinic LaPt 2 Ge 2 -type structure. Most of RPt 2 Ge 2 compounds order antiferromagnetically, approximately following the de Gennes scaling. Among them, CePt 2 Ge 2 with a Neel temperature T N1 = 2.4 K indicates a change of the magnetic structure below T N2 = 1.8 K, with an ordered moment of 0.70 µ B /Ce. The pressure experiment was also carried out for CePt 2 Ge 2 by measuring the electrical resistivity. The critical pressure, where the Neel temperature becomes zero, is 7–8 GPa at which the heavy fermion state is realized. Superconductivity was, however, not observed experimentally.