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

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Title
Superconductivity in Te-deficient polymorphic MoTe2-x and its derivatives: rich structural and electronic phase transitions
Author(s)
Se Hwang Kang; Ho Sung Yu; Jaeyoon Baik; Heejun Yang; Young Hee Lee; Suyeon Cho; Sung Wng Kim
Subject
superconductivity, ; transition metal dichalcogenide, ; polymorphism
Publication Date
2018-07
Journal
2D MATERIALS, v.5, no.3, pp.031014
Publisher
IOP PUBLISHING LTD
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 (Mo(1-y)TM(y)Te(2-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-Mo(1-y)TM(y)Te(2-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
URI
https://pr.ibs.re.kr/handle/8788114/5536
DOI
10.1088/2053-1583/aac759
ISSN
2053-1583
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
07 Kang_2018_2D_Mater._5_031014 (Superconductivity in Te-deficient).pdfDownload

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