  Herein, we report CeIrIn5 thin-film growth on a MgF2 (001) substrate using
pulsed laser deposition technique. X-ray diffraction analysis showed that the
thin films were either mainly a-axis-oriented (TF1) or a combination of a- and
c-axis-oriented (TF2). The characteristic features of Kondo coherence
temperature (Tcoh) and superconductivity (Tc) were clearly observed, where
onset of Tc is 0.58 and 0.52 K, and Tcoh = 41 K and 37 K for TF1 and TF2,
respectively. The temperature dependencies of the upper critical field (Hc2) of
both thin films and the bulk CeIrIn5 single crystal revealed a scaling
behavior, indicating that the nature of unconventional superconductivity has
not been changed in the thin film. The successful synthesis of CeIrIn5 thin
films is expected to open a new avenue for novel quantum phases that may have
been difficult to explore in the bulk crystalline samples.
