Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes

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 thickne...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-06, Vol.30 (29)
Main Authors: Hsieh, T-W, Zou, T, Hu, J, Mao, Z Q, Zhang, P P, Ke, X
Format: Article
Language:English
Subjects:
nanoflakes
transport
VRH model
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Summary: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.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aaca61