Victoria A Posey, Simon Turkel, Mehdi Rezaee, Aravind Devarakonda, Asish K Kundu, Chin Shen Ong, Morgan Thinel, Daniel G Chica, Rocco A Vitalone, Ran Jing, Suheng Xu, David R Needell, Elena Meirzadeh, Margalit L Feuer, Apoorv Jindal, Xiaomeng Cui, Tonica Valla, Patrik Thunström, Turgut Yilmaz, Elio Vescovo, David Graf, Xiaoyang Zhu, Allen Scheie, Andrew F May, Olle Eriksson, D N Basov, Cory R Dean, Angel Rubio, Philip Kim, Michael E Ziebel, Andrew J Millis, Abhay N Pasupathy, Xavier Roy
Heavy-fermion metals are prototype systems for observing emergent quantum phases driven by electronic interactions1-6 . A long-standing aspiration is the dimensional reduction of these materials to exert control over their quantum phases7-11 , which remains a significant challenge because traditional intermetallic heavy-fermion compounds have three-dimensional atomic and electronic structures. Here we report comprehensive thermodynamic and spectroscopic evidence of an antiferromagnetically ordered heavy-fermion ground state in CeSiI, an intermetallic comprising two-dimensional (2D) metallic sheets held together by weak interlayer van der Waals (vdW) interactions...
January 2024: Nature