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Abstract:
We present electrical resistivity as well as scanning tunneling microscopy and spectroscopy (STM/S) studies on Fe 1.11 Te single crystals. For this composition, a first-order phase transition is observed around 57 K This transition is associated with a structural change from the tetragonal P 4/ nmm to the monoclinic P 2 1 / m space group. Also at this temperature, the compound becomes antiferromagnetic ( T N = 57 K) and the temperature dependence of the resistivity changes from log(â T ) to T 2 . This observation suggests that the material becomes a Fermi-liquid metal at low temperatures. Metallic behavior is also confirmed in the I â V characteristics of the scanning tunneling spectroscopy measurements taken at T < T N on an atomically resolved surface.
