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Superconductivity in Te-deficient polymorphic MoTe2-x and its derivatives: Rich structural and electronic phase transitions

Title
Superconductivity in Te-deficient polymorphic MoTe2-x and its derivatives: Rich structural and electronic phase transitions
Authors
Kang S.H.Yu H.S.Baik J.Yang H.Lee Y.H.Cho S.Kim S.W.
Ewha Authors
조수연
SCOPUS Author ID
조수연scopus
Issue Date
2018
Journal Title
2D Materials
ISSN
2053-1583JCR Link
Citation
2D Materials vol. 5, no. 3
Keywords
polymorphismsuperconductivitytransition metal dichalcogenide
Publisher
IOP Publishing Ltd
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The group 6 transition metal dichalcogenides (TMDs) have been received great attentions due to intriguing superconducting states correlated with structural uncertainty and electronic complexity. Here, we synthesized Te-deficient polycrystals of semimetallic MoTe2-x and its derivatives (Mo1-y TM yTe2-x Ch x(TM: Nb, Mn and V, Ch: P)), and investigated the structural and electronic phase transitions. It was found that all Te-deficient semimetallic phases (monoclinic 1T′, hexagonal 2H and rhombohedral 3R) exhibited the superconducting transition, in which 2H and 3R structures were evolved in Nb-substituted Mo1-yNbyTe2-x (y = 0.4 for 2H, 0.6 for 3R), respectively. Moreover, we found that the superconducting state of 2H-and 3R-Mo1-yNbyTe2-x appears at the vicinity of the transition from insulator to semimetal regime with the increased electron concentration via TM substitution and Te-deficiency. It is revealed that all superconducting 1T′-, 2H- and 3R-Mo1-y TM yTe2-x Ch x semimetals show the half-dome shaped superconducting phase diagram with respect to the electron concentration and TM substitution. © 2018 IOP Publishing Ltd.
DOI
10.1088/2053-1583/aac759
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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