Heavy fermion superconductivity in the filled skutterudite compound PrOs$_4$Sb$_{12}$

TL;DR

This paper reviews the discovery of heavy fermion superconductivity in PrOs4Sb12, highlighting its unique properties, experimental findings, and the complex phases associated with magnetic or quadrupolar order.

Contribution

It provides a comprehensive review of the heavy fermion behavior, superconducting state, and high field phases in PrOs4Sb12, emphasizing its novel superconductivity emerging from a heavy Fermi liquid.

Findings

Superconductivity at Tc = 1.85 K with heavy effective mass

Presence of a high field, low temperature phase linked to magnetic or quadrupolar order

Heavy fermion behavior with effective mass approximately 50 times the electron mass

Abstract

The filled skutterudite compound \PrOsSb{} has been found to exhibit superconductivity with a critical temperature $T_\mathrm{c} = 1.85$ K that develops out of a heavy Fermi liquid with an effective mass $m^{*} \approx 50 m_\mathrm{e}$. The current experimental situation regarding the heavy fermion state, the superconducting state, and a high field, low temperature phase that is apparently associated with magnetic or quadrupolar order in \PrOsSb{} is briefly reviewed herein.