Abstract
We have carried out 115In nuclear quadrupole resonance (NQR) measurements in CeCoIn 5 under pressure P. The obtained nuclear spin-lattice relaxation rate, 1 / T 1 , of 115In at ambient pressure varies in proportion to T 1 / 4 in the normal state, and T 3 below the superconducting transition temperature T C . The results show that the system locates just at the antiferromagnetic AF instability and the anisotropic superconductivity with line nodes appears. The value of 1 / T 1 is strongly suppressed with increasing P, indicating that P moves the system away from the AF instability. The Fermi-liquid behavior was observed at the high P region. The P dependence of 1 / T 1 in the superconducting state shows that the magnitude of the superconducting energy gap scales with its T C up to 3 GPa.
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