Abstract
We report a pressure-induced evolution of magnetism and superconductivity 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 . From systematic measurements of the 115 In-NQR spectrum, it is suggested that the commensurate antiferromagnetic order with Q c =(1/2,1/2,1/2) is realized near an antiferromagentic quantum critical point. The homogeneous coexistence of superconductivity and the commensurate antiferromagnetism is observed from the measurements of a nuclear spin–lattice relaxation rates (1/ T 1 ) at 1.82 GPa. The analysis for 1/ T 1 data below T c indicates that the strong coupling superconductivity is realized above an antiferromagnetic quantum critical point.
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