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Novel phase diagram for antiferromagnetism and superconductivity in pressure-induced heavy-fermion superconductor Ce2_2RhIn8_8 probed by In-NQR

Abstract

We present a novel phase diagram for the antiferromagnetism and superconductivity in Ce2_2RhIn8_8 probed by In-NQR studies under pressure (PP). The quasi-2D character of antiferromagnetic spin fluctuations in the paramagnetic state at PP = 0 evolves into a 3D character because of the suppression of antiferromagnetic order for P>PQCP∼P > P_{\rm QCP}\sim 1.36 GPa (QCP: antiferromagnetic quantum critical point). Nuclear-spin-lattice-relaxation rate 1/T11/T_1 measurements revealed that the superconducting order occurs in the PP range 1.36 -- 1.84 GPa, with maximum Tc∼T_c\sim 0.9 K around PQCP∼P_{\rm QCP}\sim 1.36 GPa.Comment: 5 pages, 5 figures, submitted to PR

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    Last time updated on 03/01/2020