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Magnetic and superconducting properties of LaIrSi$$_3$$ and CeIrSi$$_3$$ with the non-centrosymmetric crystal structure

Okuda, Yusuke*; Miyauchi, Yuichiro*; Ida, Yuki*; Takeda, Yuji*; Tonohiro, Chie*; Ozuchi, Yasuhiro*; Yamada, Tsutomu*; Nguyen, D.; Matsuda, Tatsuma; Haga, Yoshinori ; Takeuchi, Tetsuya*; Hagiwara, Masayuki*; Kindo, Koichi*; Harima, Hisatomo*; Sugiyama, Kiyohiro*; Settai, Rikio*; Onuki, Yoshichika*

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 super- conductivity 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. The electronic state of CeIrSi$$_3$$ is tuned from the antiferro- magnetic 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. Large magnitude and anisotropy of H$$_{c2}$$(0) in CeIrSi$$_3$$ are consistent with the theoretical prediction for superconductivity in the non-centrosymmetric crystal structure.

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Category:Physics, Multidisciplinary

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