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New insights into the diverse electronic phases of a novel vanadium dioxide polymorph: a terahertz spectroscopy study.

Abstract：

:A remarkable feature of vanadium dioxide is that it can be synthesized in a number of polymorphs. The conductivity mechanism in the metastable layered polymorph VO2(B) thin films has been investigated by terahertz time-domain spectroscopy (THz-TDS). In VO2(B), a critical temperature of 240 K marks the appearance of a non-zero Drude term in the observed complex conductivity, indicating the evolution from a pure insulating state towards a metallic state. In contrast, the THz conductivity of the well-known VO2(M1) is well fitted only by a modification of the Drude model to include backscattering. We also identified two different THz conductivity regimes separated by temperature in these two polymorphs. The electronic phase diagram is constructed, revealing that the width and onset of the metal-insulator transition in the B phase develop differently from the M1 phase.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Lourembam J,Srivastava A,La-o-vorakiat C,Rotella H,Venkatesan T,Chia EE

doi

10.1038/srep09182

subject

Has Abstract

pub_date

2015-03-17 00:00:00

pages

9182

issn

2045-2322

pii

srep09182

journal_volume

5

pub_type

杂志文章

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