Confinement of heavy fermion to two-dimension by the fabrication of the artificial superlatattice

To date the electronic structure of all heavy-fermion compounds is essentially three-dimensional. Confinement of the heavy-fermions to reduced dimensions is expected to provide a novel physical system with ultimately strong correlations and enhanced quantum fluctuations. We have grown artificial superlattices of CeIn$_3$ ($m$) / LaIn$_3$ ($n$), in which $m$-layers of heavy-fermion antiferromagnet CeIn$_3$ and $n$-layers of a non-magnetic isostructual compound LaIn$_3$ are stacked alternately, by a molecular beam epitaxy. By reducing the thickness of CeIn$_3$, we observe a suppression of antiferromagnetic order, a deviation of the Fermi liquid behavior and an enhancement of effective mass inferred from the resistivity coefficient, which imply new `dimensional tuning' towards a quantum critical point.