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

Research output: Contribution to journalArticle

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
StatePublished - 2018

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flakes
Magnetoresistance
Transport properties
transport properties
Phase transitions
Cooling
cooling

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title = "Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes",
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.",
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Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes. / Hsieh, T.-W.; Zou, T.; Hu, J.; Mao, Z.Q.; Zhang, P.P.; Ke, X.

In: Journal of Physics Condensed Matter, Vol. 30, No. 29, 2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thickness evolution of transport properties in exfoliated Fe1+yTe nanoflakes

AU - Hsieh, T.-W.

AU - Zou, T.

AU - Hu, J.

AU - Mao, Z.Q.

AU - Zhang, P.P.

AU - Ke, X.

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N2 - 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.

AB - 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.

U2 - 10.1088/1361-648X/aaca61

DO - 10.1088/1361-648X/aaca61

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JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

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