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Observation of new intrinsic properties of VO2

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arxiv 1007.4624 v2 pith:TUHWOD7N submitted 2010-07-27 cond-mat.mtrl-sci

Observation of new intrinsic properties of VO2

Bongjin Simon Mun , Kai Chen , Youngchul Leem , Catherine Dejoie , Nobumichi Tamura , Martin Kunz , Zhi Liu , Michael E. Grass
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Changwoo Park Y. Yvette Lee Honglyoul Ju
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classification cond-mat.mtrl-sci
keywords transitiondegreesphaseswhileabruptanalysisboundarycrystal
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The single crystal VO2, exihibiting a first-order metal-insulator transition (MIT) at 67.2 degrees C and an insulator-insulator transition (IIT) at ~49.7 degrees C, is grown. From synchrotron-based x-ray microdiffraction analysis, the IIT shows structural phase transition (SPT) of monoclinic M2 to M1 phases while the MIT displays M1 to rutile R phases. The IIT exhibits percolative SPT while the MIT shows abrupt transition width of < 0.02 degrees C, supporting Mott's prediction. The MIT occurs non-percolatively with a sharp boundary between R and M1 phases. The MIT onset temperature shows significant variation.

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