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arXiv · 0906.0078

Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn$_5$ Studied by In-NQR Spectroscopy

M. Yashima·H. Mukuda·Y. Kitaoka·H. Shishido·R. Settai·Y. Onuki
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Abstract

We report on a novel pressure ($P$)-induced evolution of magnetism and superconductivity (SC) in a helical magnet CeRhIn$_5$ with an incommensurate wave vector $Q_i=({1/2},{1/2},0.297)$ through the $^{115}$In nuclear quadrupole resonance (NQR) measurements under $P$. Systematic measurements of the $^{115}$In-NQR spectrum reveal that the commensurate antiferromagnetism (AFM) with $Q_c=({1/2},{1/2},{1/2})$ is realized above $P_m \sim$ 1.7 GPa. An important finding is that the size of SC gap and $T_c$ increase as the magnitude of the AFM moment decreases in the $P$ region, where SC uniformly coexists with the commensurate AFM. This result provides evidence of strong coupling between the commensurate AFM order parameter (OP) and SC OP.

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M. Yashima, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki. 2009-05-30. Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn$_5$ Studied by In-NQR Spectroscopy. https://doi.org/10.1103/physrevb.79.214528

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