Simultaneous collapse of antiferroquadrupolar order and superconductivity in PrIr${}_2$Zn${}_{20}$ by nonhydrostatic pressure

Abstract

Superconductivity in PrIr${}_2$Zn${}_{20}$ appears at $T_{\mathrm{c}}=0.05$ K in the presence of an antiferroquadrupolar order below $T_{\mathrm{Q}}=0.11$ K. We have studied pressure dependences of $T_{\mathrm{c}}$, $T_{\mathrm{Q}}$, and non-Fermi liquid behaviors in the resistivity $\rho (T)$ by using two pressure transmitting media: argon maintaining highly hydrostatic pressure, and glycerol, which solidifies above 5 GPa producing nonhydrostatic pressure. Upon applying $P$ with argon up to 10.6 GPa, $T_{\mathrm{c}}$ hardly changes, while $T_{\mathrm{Q}}$ monotonically increases from 0.11 to 0.23 K. With glycerol, however, $T_{\mathrm{Q}}$ and $T_{\mathrm{c}}$ simultaneously fall below 0.04 K at 6.3 GPa. The contrasting results indicate that onsite quadrupolar fluctuations induce superconductivity in this compound.

15 pages, 4 figures

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