<研究ノート>重い電子系の超格子構造 -新たな2次元量子臨界系-

Abstract

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.