Novel coexistence of superconductivity with two distinct magnetic orders.

The heavy fermion ${\mathrm{CeRh}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{In}}_{5}$ system exhibits properties that range from an incommensurate antiferromagnet for small $x$ to an exotic superconductor on the Ir-rich end of the phase diagram. At intermediate $x$ where antiferromagnetism coexists with superconductivity, two types of magnetic order are observed: the incommensurate one of ${\mathrm{CeRhIn}}_{5}$ and a new, commensurate antiferromagnetism that orders separately. The coexistence of $f$-electron superconductivity with two distinct $f$-electron magnetic orders is unique among unconventional superconductors, adding a new variety to the usual coexistence found in magnetic superconductors.