Superconductivity in Te-deficient polymorphic MoTe2-x and its derivatives: rich structural and electronic phase transitions
- 주제(키워드) superconductivity , transition metal dichalcogenide , polymorphism
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Kang, Se Hwang; Yu, Ho Sung; Yang, Heejun; Lee, Young Hee; Kim, Sung Wng] Sungkyunkwan Univ SKKU, Dept Energy Sci, Suwon 16419, South Korea; [Kang, Se Hwang; Yu, Ho Sung; Lee, Young Hee] Inst Basic Sci, Ctr Integrated Nanostruct Phys, Suwon 16419, South Korea; [Baik, Jaeyoon] Pohang Accelerator Lab, Beamline Div, Pohang 37673, South Korea; [Cho, Suyeon] Ewha Womans Univ, Div Chem Engn & Mat Sci, Seoul 03760, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 IOP PUBLISHING LTD
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151884
- 본문언어 영어
- Published As http://dx.doi.org/10.1088/2053-1583/aac759
초록/요약
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.
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