Phase diagram for antiferromagnetism and superconductivity in the pressure-induced heavy-fermion superconductorCe2RhIn8probed byI115n-NQR

Abstract

We present a phase diagram for the antiferromagnetism and superconductivity in ${\text{Ce}}_{2}{\text{RhIn}}_{8}$ probed by In-NQR studies under pressure $(P)$. The quasi-two-dimensional character of antiferromagnetic spin fluctuations in the paramagnetic state at $P=0$ evolves into a three-dimensional character because of the suppression of antiferromagnetic order for $Pg{P}_{\text{QCP}}\ensuremath{\sim}1.36\text{ }\text{GPa}$ (QCP: quantum critical point). Nuclear-spin-lattice relaxation rate $1/{T}_{1}$ measurements revealed that the superconducting order occurs in the $P$ range 1.36--1.84 GPa, with maximum ${T}_{c}\ensuremath{\sim}0.9\text{ }\text{K}$ around ${P}_{\text{QCP}}\ensuremath{\sim}1.36\text{ }\text{GPa}$.