Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-30
Phys. Rev. B 79, 214528 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.79.214528
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.
Kitaoka Yoshio
Mukuda Hidekazu
Onuki Yoshichika
Settai Rikio
Shishido Hiroaki
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