Novel phase diagram for antiferromagnetism and superconductivity in pressure-induced heavy-fermion superconductor Ce${}_2$RhIn${}_8$ probed by In-NQR

Abstract

We present a novel phase diagram for the antiferromagnetism and superconductivity in Ce${}_2$RhIn${}_8$ probed by In-NQR studies under pressure ($P$). The quasi-2D character of antiferromagnetic spin fluctuations in the paramagnetic state at $P$ = 0 evolves into a 3D character because of the suppression of antiferromagnetic order for $P>P_{\mathrm{QCP}}\sim$ 1.36 GPa (QCP: antiferromagnetic 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 $T_c\sim$ 0.9 K around $P_{\mathrm{QCP}}\sim$ 1.36 GPa.

5 pages, 5 figures, submitted to PRB

References in corpus (4)

• Interacting Antiferromagnetic Droplets in Quantum Critical CeCoIn_5
• Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure
• Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn${}_5$ Studied by In-NQR Spectroscopy
• Evolution of an Unconventional Superconducting State inside the Antiferromagnetic Phase of CeNiGe${}_3$ under Pressure: a ${}^{73}$Ge-Nuclear-Quadrupole-Resonance Study