SEMICONDUCTOR-METAL TRANSITIONS IN TmSe-TmTe AND TmSe-EuSe
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چکیده
A semiconductor to metal transition (SMT) occurs either as a function of composition or external pressure in the TmSe-TmTe and TmSe-EuSe pseudobinary com ounds. The transition is caused by the delocalization of electrons from the 4flq shell of divalent Tm into the 5d conduction band. The divalent configuration (4f7) of the Eu ions is more stable and therefore is not involved in the SMT. A striking similarity between the SMT in TmSel-xTex as a function of x and the pressure induced SMT in SmS is observed and it is suggested that a particular combination of the electronic and elastic parameters is the factor determining the order of transition.
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تاریخ انتشار 2016