I. Sugitani

NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe3

We measured the electrical resistivity under pressure for an antiferromagnet CeCoGe3 without inversion symmetry in the tetragonal crystal structure. The Neel temperature TN1 = 21 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 5.5 GPa. Superconductivity appears above 4.3 GPa, with a superconduting transition temperature Tsc = 0.72 K and a large upper critical field Hc2(0) = 7 T at 5.6 GPa. The large upper critical field Hc2(0)= 7 T exceeds the Pauli limitting field Hp (≃ 1.86Tsc)=1.3 T as in CePt3Si, CeRhSi3 and CeIrSi3. The large slope of Hc2 at Tsc, -dHc2/dT = 18T/K, at 5.6 GPa indicates the heavy-fermion superconductivity in CeCoGe3.

Magnetic and electronic properties in CeTSi3 and CeTGe3 (T: Transition metal)

We investigated the magnetic properties of CeTSi3CeTSi3 (T: Ru, Os, Co, Rh, Ir, Pd and Pt) and CeTGe3CeTGe3 (T: Co, Rh and Ir) by measuring their electrical resistivity and magnetic susceptibility. CeRuSi3CeRuSi3, CeOsSi3CeOsSi3 and CeCoSi3CeCoSi3 do not order magnetically, with a large Kondo temperature of about 200K. The other compounds order antiferromagnetically, and are very similar to each other in their magnetic and electronic properties, which is related to a large crystalline electric field (CEF) splitting energy of the 4f4f electron, about 500K in CeIrSi3CeIrSi3.

Magnetic and electronic properties in CeTSi3CeTSi3 and CeTGe3CeTGe3 (T: transition metal)

We investigated the magnetic properties of CeTSi3CeTSi3 (T: Ru, Os, Co, Rh, Ir, Pd and Pt) and CeTGe3CeTGe3 (T: Co, Rh and Ir) by measuring their electrical resistivity and magnetic susceptibility. CeRuSi3CeRuSi3, CeOsSi3CeOsSi3 and CeCoSi3CeCoSi3 do not order magnetically, with a large Kondo temperature of about 200K. The other compounds order antiferromagnetically, and are very similar to each other in their magnetic and electronic properties, which is related to a large crystalline electric field (CEF) splitting energy of the 4f4f electron, about 500K in CeIrSi3CeIrSi3.

Magnetic and electronic properties in and (T: transition metal)

We investigated the magnetic properties of CeTSi3CeTSi3 (T: Ru, Os, Co, Rh, Ir, Pd and Pt) and CeTGe3CeTGe3 (T: Co, Rh and Ir) by measuring their electrical resistivity and magnetic susceptibility. CeRuSi3CeRuSi3, CeOsSi3CeOsSi3 and CeCoSi3CeCoSi3 do not order magnetically, with a large Kondo temperature of about 200K. The other compounds order antiferromagnetically, and are very similar to each other in their magnetic and electronic properties, which is related to a large crystalline electric field (CEF) splitting energy of the 4f4f electron, about 500K in CeIrSi3CeIrSi3.

Anisotropic magnetic properties of single crystal

We have succeeded in growing single crystals of Ce2Ni3Ge5Ce2Ni3Ge5, which crystallizes in the orthorhombic crystal structure, by the flux method and studied the anisotropic physical properties by measuring the electrical resistivity, magnetic susceptibility and specific heat. The results of these measurements indicate that Ce2Ni3Ge5Ce2Ni3Ge5 undergoes two antiferromagnetic transitions at TN1=4.9K and TN2=4.3K. The electrical resistivity and susceptibility measurements reveal strong anisotropic magnetic properties. From the specific heat measurement the electronic specific heat coefficient was found to be 90mJ/K2Ce mol.

Anisotropic magnetic properties of Ce2Ni3Ge5Ce2Ni3Ge5 single crystal

We have succeeded in growing single crystals of Ce2Ni3Ge5Ce2Ni3Ge5, which crystallizes in the orthorhombic crystal structure, by the flux method and studied the anisotropic physical properties by measuring the electrical resistivity, magnetic susceptibility and specific heat. The results of these measurements indicate that Ce2Ni3Ge5Ce2Ni3Ge5 undergoes two antiferromagnetic transitions at TN1=4.9K and TN2=4.3K. The electrical resistivity and susceptibility measurements reveal strong anisotropic magnetic properties. From the specific heat measurement the electronic specific heat coefficient was found to be 90mJ/K2Ce mol.

Anisotropic magnetic properties of Ce2Ni3Ge5 single crystal

We have succeeded in growing single crystals of Ce2Ni3Ge5Ce2Ni3Ge5, which crystallizes in the orthorhombic crystal structure, by the flux method and studied the anisotropic physical properties by measuring the electrical resistivity, magnetic susceptibility and specific heat. The results of these measurements indicate that Ce2Ni3Ge5Ce2Ni3Ge5 undergoes two antiferromagnetic transitions at TN1=4.9K and TN2=4.3K. The electrical resistivity and susceptibility measurements reveal strong anisotropic magnetic properties. From the specific heat measurement the electronic specific heat coefficient was found to be 90mJ/K2Ce mol.