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Journal Articles

Anisotropic magnetic properties of Ce$$_2$$Ni$$_3$$Ge$$_5$$ single crystal

Thamizhavel, A.*; Sugitani, Ichiro*; Obiraki, Yoshiko*; Nakashima, Miho*; Okuda, Yusuke*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Settai, Rikio*; et al.

Physica B; Condensed Matter, 378-380, p.841 - 842, 2006/05

 Times Cited Count:0 Percentile:0(Physics, Condensed Matter)

We have succeeded in growing single crystals of Ce$$_2$$Ni$$_3$$Ge$$_5$$, 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 Ce$$_2$$Ni$$_3$$Ge$$_5$$ undergoes two antiferromagnetic transitions at $$T_{N1}$$=4.9 K and $$T_{N2}$$=4.3 K. 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/K$$^2$$mol.

Journal Articles

Pressure-induced heavy-fermion superconductivity in antiferromagnet CeIrSi$$_3$$ without inversion symmetry

Sugitani, Ichiro*; Okuda, Yusuke*; Shishido, Hiroaki*; Yamada, Tsutomu*; Thamizhavel, A.*; Yamamoto, Etsuji; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Settai, Rikio*; et al.

Journal of the Physical Society of Japan, 75(4), p.043703_1 - 043703_4, 2006/04

 Times Cited Count:338 Percentile:98.83(Physics, Multidisciplinary)

We report the discovery of pressure-induced superconductivity in an antiferromagnet CeIrSi$$_3$$, which lacks inversion symmetry in the tetragonal crystal structure. The Neel temperature $$T_N$$ = 5.0 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 2.5 GPa. Superconductivity appears in a wide pressure region from 1.8 GPa to about 3.5 GPa, with a relatively large superconduting transition temperature Tsc= 1.6 K and a large upper critical field $$H_{c2}$$(0) = 11.1 T at 2.5 GPa, indicating heavy-fermion superconductivity.

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