2003/02/24 by S. Yeo, Sunmog Yeo, S. Nakatsuji +9 · 2 citations
Materials Science · Physics and Astronomy · #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.91.046401
arxiv created 2003/02/24 · openalex publication_date 2003/07/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The phase diagram of FeSi_1\ensuremath-xGex, obtained from magnetic, thermal, and transport measurements on single crystals, shows a discontinuous transition from Kondo insulator to ferromagnetic metal with x at a critical concentration, xc\ensuremath≈0.25. The gap of the insulating phase strongly decreases with x. The specific heat \ensuremathγ coefficient appears to track the density of states of a Kondo insulator. The phase diagram is consistent with an insulator-metal transition induced by a reduction of the hybridization with x in conjunction with disorder on the Si/Ge ligand site.