Unconventional superconductivity and magnetism in $\rm CePt_3Si_{1-x}Ge_x$

Details Unconventional superconductivity and magnetism in $\rm CePt_3Si_{1-x}Ge_x$ Unconventional superconductivity and magnetism in $\rm CePt_3Si_{1-x}Ge_x$

2004-08-11

arxiv.org/abs/cond-mat/0408244v1

Physics

Condensed Matter

Superconductivity

6 pages, 9 figures, SCES'04

Scientific paper

10.1016/j.physb.2005.01.062

$\rm CePt_3Si$ is a novel ternary compound exhibiting antiferromagnetic order at $T_N \approx 2.2$ K and superconductivity (SC) at $T_c \approx 0.75$ K. Large values of $H_{c2}' \approx -8.5$ T/K and $H_{c2}(0) \approx 5$ T indicate Cooper pairs formed out of heavy quasiparticles. The mass enhancement originates from Kondo interaction with a characteristic temperature $T_K \approx 8$ K. NMR and $\mu$SR measurements evidence coexistence of SC and long range magnetic order on a microscopic scale. Moreover, $\rm CePt_3Si$ is the first heavy fermion SC without an inversion symmetry. This gives rise to a novel type of the NMR relaxation rate $1/T_1$ which is very unique and never reported before for other heavy fermion superconductors. Studies of Si/Ge substitution allow us to establish a phase diagram.

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