Abstract
Semiconducting TmSe1−xTex (x=0.55, 0.68) reveals at low temperatures an anomalous peak structure in the resistivity pressure relation followed by a first-order transition into a metallic state. It is believed that the electron-hole interaction plays an important role and speculated that these data show the transition from a normal semiconductor to an excitonic insulator followed by a transition into an electron-hole liquid. Neutron scattering indicates ferromagnetism in pressure-driven metallic TmSe0.45Te0.55 below ∼5 K.
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