We report the evolution of transport properties in exfoliated Fe1+yTe (y = 0.04) nanoflakes of various thickness. In contrast to the sharp semiconducting-to-metallic phase transition observed in both bulk and thicker flakes, this transition becomes broadened for flakes with an intermediate thickness followed by the appearance of a superconducting-like feature upon further cooling. With the thickness further decreased, the flakes exhibit insulating transport behavior with significantly enhanced positive magnetoresistance, which can be explained using a variable range hopping mechanism, suggesting the nature of a highly disordered 2D system. \ 2018 IOP Publishing Ltd.
Hsieh, T-W., Zou, T., Hu, J., Mao, Z. Q., Zhang, P. P., & Ke, X. (2018). Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes. Journal of Physics Condensed Matter, 30(29). https://doi.org/10.1088/1361-648X/aaca61