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The phase diagram of FeSi1-xGex, obtained from magnetic, thermal andtransport measurements on single crystals, shows a first-order transition froma correlated electron semiconductor to a ferromagnetic metal at a criticalconcentration, x ~ 0.25. The gap of the insulating phase strongly decreaseswith x. The specific heat coefficient appears to track the density of states ofa Kondo insulator. The phase diagram is consistent with a correlation inducedinsulator-metal transition in conjunction with disorder on the Si/Ge ligandsite

physical review letters

First-Order Transition from a Kondo Insulator to a Ferromagnetic Metal in Single Crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">i</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">G</mml:mi><…

First-Order Transition from a Kondo Insulator to a Ferromagnetic Metal in Single CrystallineFeSi1−xG<…