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Huge upper critical field in the superconductor with non-centrosymmetric crystal structure CeCoGe$$_3$$

反転中心を持たない結晶構造を持つCeCoGe$$_3$$の超伝導状態における巨大上部臨界磁場

M$'e$asson, M.-A.*; 村中 大志*; 松田 達磨; 河井 友也*; 芳賀 芳範   ; Knebel, G.*; 青木 大*; Lapertot, G.*; 本多 史憲*; 摂待 力生*; Brison, J. P.*; Flouquet, J.*; 清水 克哉*; 大貫 惇睦*

M$'e$asson, M.-A.*; Muranaka, Hiroshi*; Matsuda, Tatsuma; Kawai, Tomoya*; Haga, Yoshinori; Knebel, G.*; Aoki, Dai*; Lapertot, G.*; Honda, Fuminori*; Settai, Rikio*; Brison, J. P.*; Flouquet, J.*; Shimizu, Katsuya*; Onuki, Yoshichika*

We report the upper critical field, $$H_{c2}$$, of the non-centrosymmetric compound CeCoGe$$_3$$ by resistivity measurements under high pressure of 7.1 GPa, for $$H$$ along $$c$$ and $$a$$ axis, and for a magnetic field up to 17T. $$H_{c2}$$ is very anisotropic, saturating at low temperature for $$H$$ along the $$a$$ axis and linear for $$H$$ along the $$c$$ axis. Very high $$H_{c2}$$($$T$$) is observed for $$H$$ along the $$c$$ axis, with a huge value of the slope d$$H$$$$_{c2}$$/d$$T$$ =-47 $$pm$$ 1.3 T/K, the highest ever reported if normalized to the superconducting temperature of 0.65 K. This is most probably related to a conjunction of a heavy fermionic state and the absence of the Pauli limitation. A fit of $$H_{c2}$$($$T$$) shows that the curves for a and $$c$$ axis can be reproduced with a moderate coupling Eliashberg theory.

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パーセンタイル:22.02

分野:Physics, Applied

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