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Probing enhanced superconductivity in van der Waals polytypes of VxTaS2

Pudelko, Wojciech R. ; Liu, Huanlong ; Petocchi, Francesco ; Li, Hang ; Guedes, Eduardo Bonini ; Küspert, Julia ; Von Arx, Karin ; Wang, Qisi ; Wagner, Ron Cohn and Polley, Craig M. LU , et al. (2024) In Physical Review Materials 8(10).
Abstract

Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a promising route to manipulate TMDs' properties, not only as a means to engineer quantum devices but also as a route to explore fundamental physics in complex matter. Here we use angle-resolved photoemission (ARPES) to investigate a strong layering-dependent enhancement of superconductivity in TaS2, in which the superconducting transition temperature, Tc, of its 2H structural phase is nearly tripled when insulating 1T layers are inserted into the system. The study is facilitated by a vanadium-intercalation approach to synthesizing various TaS2 polytypes, which... (More)

Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a promising route to manipulate TMDs' properties, not only as a means to engineer quantum devices but also as a route to explore fundamental physics in complex matter. Here we use angle-resolved photoemission (ARPES) to investigate a strong layering-dependent enhancement of superconductivity in TaS2, in which the superconducting transition temperature, Tc, of its 2H structural phase is nearly tripled when insulating 1T layers are inserted into the system. The study is facilitated by a vanadium-intercalation approach to synthesizing various TaS2 polytypes, which improves the quality of the ARPES data while leaving key aspects of the electronic structure and properties intact. The spectra show the clear opening of the charge density wave gap in the pure 2H phase and its suppression when 1T layers are introduced to the system. Moreover, in the mixed-layer 4Hb system, we observe a strongly momentum-anisotropic increase in electron-phonon coupling near the Fermi level relative to the 2H phase. Both phenomena help to account for the increased Tc in mixed 2H/1T layer structures.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Materials
volume
8
issue
10
article number
104802
publisher
American Physical Society
external identifiers
  • scopus:85209214671
ISSN
2475-9953
DOI
10.1103/PhysRevMaterials.8.104802
language
English
LU publication?
yes
id
08706b78-2181-4a1a-92c0-8c7c517e713f
date added to LUP
2025-01-21 15:57:34
date last changed
2025-04-04 14:36:52
@article{08706b78-2181-4a1a-92c0-8c7c517e713f,
  abstract     = {{<p>Layered transition metal dichalcogenides (TMDs) stabilize in multiple structural forms with profoundly distinct and exotic electronic phases. Interfacing different layer types is a promising route to manipulate TMDs' properties, not only as a means to engineer quantum devices but also as a route to explore fundamental physics in complex matter. Here we use angle-resolved photoemission (ARPES) to investigate a strong layering-dependent enhancement of superconductivity in TaS2, in which the superconducting transition temperature, Tc, of its 2H structural phase is nearly tripled when insulating 1T layers are inserted into the system. The study is facilitated by a vanadium-intercalation approach to synthesizing various TaS2 polytypes, which improves the quality of the ARPES data while leaving key aspects of the electronic structure and properties intact. The spectra show the clear opening of the charge density wave gap in the pure 2H phase and its suppression when 1T layers are introduced to the system. Moreover, in the mixed-layer 4Hb system, we observe a strongly momentum-anisotropic increase in electron-phonon coupling near the Fermi level relative to the 2H phase. Both phenomena help to account for the increased Tc in mixed 2H/1T layer structures.</p>}},
  author       = {{Pudelko, Wojciech R. and Liu, Huanlong and Petocchi, Francesco and Li, Hang and Guedes, Eduardo Bonini and Küspert, Julia and Von Arx, Karin and Wang, Qisi and Wagner, Ron Cohn and Polley, Craig M. and Leandersson, Mats and Osiecki, Jacek and Thiagarajan, Balasubramanian and Radović, Milan and Werner, Philipp and Schilling, Andreas and Chang, Johan and Plumb, Nicholas C.}},
  issn         = {{2475-9953}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Materials}},
  title        = {{Probing enhanced superconductivity in van der Waals polytypes of VxTaS2}},
  url          = {{http://dx.doi.org/10.1103/PhysRevMaterials.8.104802}},
  doi          = {{10.1103/PhysRevMaterials.8.104802}},
  volume       = {{8}},
  year         = {{2024}},
}