Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes

T.-W. Hsieh, T. Zou, J. Hu, Z.Q. Mao, P.P. Zhang, X. Ke

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Abstract

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.
Original languageEnglish
JournalJournal of Physics Condensed Matter
Volume30
Issue number29
DOIs
Publication statusPublished - 2018

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