View : 28 Download: 0

Full metadata record

DC FieldValueLanguage
dc.contributor.author조수연-
dc.date.accessioned2017-08-29T06:04:59Z-
dc.date.available2017-08-29T06:04:59Z-
dc.date.issued2017-
dc.identifier.issn2053-1583-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/235398-
dc.description.abstractTwo-dimensional (2D) transition metal dichalcogenides (TMDs) have received great attentions because of diverse quantum electronic states such as topological insulating (TI), Weyl semimetallic (WSM) and superconducting states. Recently, the superconducting states emerged in pressurized semimetallic TMDs such as MoTe2 and WTe2 have become one of the central issues due to their predicted WSM states. However, the difficulty in synthetic control of chalcogen vacancies and the ambiguous magneto transport properties have hindered the rigorous study on superconducting and WSM states. Here, we report the emergence of superconductivity at 2.1 K in Te-deficient orthorhombic Td-MoTe2-x with an intrinsic electron-doping, while stoichiometric monoclinic 1T'-MoTe2 shows no superconducting state down to 10 mK, but exhibits a large magnetoresistance of 32 000% at 2 K in a magnetic field of 14 T originating from nearly perfect compensation of electron and hole carriers. Scanning tunnelling spectroscopy and synchrotron x-ray diffraction combined with theoretical calculations clarify that Te vacancies trigger superconductivity via intrinsic electron doping and the evolution of the Td phase from the 1T' phase below 200 K. Unlike the pressure-induced superconducting state of monoclinic MoTe2, this Te vacancy-induced superconductivity is emerged in orthorhombic MoTe2, which is predicted as Weyl semimetal, via electron-doping. This chalcogen vacancy induced-superconductivity provides a new route for cultivating superconducting state together with WSM state in 2D van der Waals materials. © 2017 IOP Publishing Ltd-
dc.languageEnglish-
dc.publisherIOP Publishing Ltd-
dc.subjectSuperconductivity-
dc.subjectTopological semimetal-
dc.subjectTransition metal dichalcogenides-
dc.titleTe vacancy-driven superconductivity in orthorhombic molybdenum ditelluride-
dc.typeArticle-
dc.relation.issue2-
dc.relation.volume4-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.journaltitle2D Materials-
dc.identifier.doi10.1088/2053-1583/aa735e-
dc.identifier.wosidWOS:000402724500002-
dc.identifier.scopusid2-s2.0-85021061210-
dc.author.googleCho S.-
dc.author.googleKang S.H.-
dc.author.googleYu H.S.-
dc.author.googleKim H.W.-
dc.author.googleKo W.-
dc.author.googleHwang S.W.-
dc.author.googleHan W.H.-
dc.author.googleChoe D.-H.-
dc.author.googleJung Y.H.-
dc.author.googleChang K.J.-
dc.author.googleLee Y.H.-
dc.author.googleYang H.-
dc.author.googleKim S.W.-
dc.contributor.scopusid조수연(55772631700)-
dc.date.modifydate20170922142015-
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE