First-order transition from a Kondo insulator to a ferromagnetic metal in single crystalline FeSi(1-x)Ge(x) |
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Authors: | Yeo S Nakatsuji S Bianchi A D Schlottmann P Fisk Z Balicas L Stampe P A Kennedy R J |
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Institution: | National High Magnetic Field Laboratory (NHMFL), Tallahassee, Florida 32310, USA. |
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Abstract: | The phase diagram of FeSi(1-x)Ge(x), 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, x(c) approximately 0.25. The gap of the insulating phase strongly decreases with x. The specific heat gamma 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. |
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