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Recent advancements have established self-intercalation as a powerful technique for manipulating quantum material properties, with precisely controllable intercalation concentrations. Given the inherently rich phase diagrams of transition…

Materials Science · Physics 2025-05-30 Yuhui Yan , Lingxiao Xiong , Feipeng Zheng

Charge density wave (CDW) and their interplay with correlated and topological quantum states are forefront of condensed matter research. The 4$H_{b}$-TaS$_2$ is a CDW ordered quantum heterostructure that is formed by alternative stacking of…

We systematically investigated the superconducting properties and the interplay between charge-density-waves (CDW) and superconductivity in lithium-intercalated 2H-TaS2. By gradually increasing the lithium content x, the CDW formation…

Superconductivity · Physics 2021-09-08 Huanlong Liu , Shangxiong Huangfu , Xiaofu Zhang , Hai Lin , Andreas Schilling

1T-TiSe$_2$ hosts a $2 \times 2 \times 2$ charge density wave (CDW) that is known to form the state with localized domains separated by the domain walls upon Cu intercalation. The CDW state with the domain wall network has attracted…

Strongly Correlated Electrons · Physics 2024-07-02 Q. Hu , R. Venturini , Y. Vaskivskyi , J. Lipič , Z. Jagličić , D. Mihailovic

Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in naturally occurring materials. Unfortunately, this approach is currently limited to…

We investigate electronic instabilities in 2H-TaS\textsubscript{2} and a self-intercalated variant, 2H$^\dagger$-Ta\textsubscript{1+$\delta$}S\textsubscript{2}. In conventional samples, which we determine to be slightly hole-doped, spectral…

Charge density waves (CDWs) are periodic modulations of the conduction electron density in solids. They are collective states that arise from intrinsic instabilities often present in low dimensional electronic systems. The layered…

We report coexistence of bulk superconductivity and charge density wave (CDW) with superconducting critical temperature Tc = 3.8 K in Cu intercalated quasi-two-dimensional crystals of ZrTe3. The Cu intercalation results in the expansion of…

Superconductivity · Physics 2011-06-27 Xiangde Zhu , Hechang Lei , C. Petrovic

Unconventional charge and spin density-wave states are commonly observed in bilayer nickelates, drawing considerable attention due to their proximity to high-$T_c$ superconductivity in various phase diagrams. However, the nature and…

Superconductivity · Physics 2026-04-02 Daisuke Inoue , Youichi Yamakawa , Seiichiro Onari , Hiroshi Kontani

The transition metal dichalcogenide 1T-TaS$_2$ is well known to harbor a rich variety of charge density wave (CDW) distortions which are correlated with underlying lattice atom modulations. The long range CDW phases extend throughout the…

Materials Science · Physics 2017-05-24 Xiaochen Zhu , Ang J. Li , G. R. Stewart , Arthur F. Hebard

An unexpected feature common to 2H-transition metal dichalcogenides (2H-TMDs) is revealed with first-principles Wannier functions analysis of the electronic structure of the prototype 2H-TaSe2: The low-energy Ta \red{``$5d_{z^2}$''} bands…

Strongly Correlated Electrons · Physics 2009-11-11 Ryan Barnett , Anatoli Polkovnikov , Eugene Demler , Wei-Guo Yin , Wei Ku

2$H$-TaSe$_2$ has been one of unique transition metal dichalcogenides exhibiting several phase transitions due to a delicate balance among competing electronic ground states. An unusual metallic state at high-$T$ is sequentially followed by…

Superconductivity · Physics 2016-03-21 D. Bhoi , S. Khim , W. Nam , B. S. Lee , Chanhee Kim , B. -G. Jeon , B. H. Min , S. Park , Kee Hoon Kim

Transition metal dichalcogenides are rich in their structural phases, e.g. 1T-TaS2 and 1T-TaSe2 form charge density wave (CDW) under low temperature with interesting and exotic properties. Here, we present a systematic study of different…

Materials Science · Physics 2022-01-12 Tao Jiang , Tao Hu , Guodong Zhao , Yongchang Li , Shaowen Xu , Chao Liu , Yaning Cui , Wei Ren

Charge density wave (CDW) instability is often found in phase diagrams of superconductors such as cuprates and certain transition-metal dichalcogenides. This proximity to superconductivity triggers the question on whether CDW instability is…

Transition-metal dichalcogenides (TMDs) $MX_2$ ($M$ = Ti, Nb, Ta; $X$ = S, Se, Te) exhibit a rich set of charge density wave (CDW) orders, which usually coexist and/or compete with superconductivity. The mechanisms of CDWs and…

Strongly Correlated Electrons · Physics 2017-08-16 Y. Liu , D. F. Shao , L. J. Li , W. J. Lu , X. D. Zhu , P. Tong , R. C. Xiao , L. S. Ling , C. Y. Xi , L. Pi , H. F. Tian , H. X. Yang , J. Q. Li , W. H. Song , X. B. Zhu , Y. P. Sun

We report the characterization of layered, 2H-type CuxTaS2, for x between 0 and 0.12. The charge density wave (CDW), at 70 K for TaS2, is destabilized with Cu doping. The sub-1K superconducting transition in undoped 2H-TaS2 jumps quickly to…

The layered transition metal dichalcogenide, TaSe2, exhibits rich electronic phenomena across its polymorphs, 1T, 2H, and 3R, largely driven by differences in atomic coordination and c-axis stacking. In the 1T phase, octahedral coordination…

Superconductivity · Physics 2026-02-13 Kusal Dharmasiri , Maxim Avdeev , Despina Louca

Understanding the coexistence, competition and/or cooperation between superconductivity and charge density waves (CDWs) in the transition metal dichalcogenides (TMDs) is an elusive goal which, when realized, promises to reveal fundamental…

Superconductivity · Physics 2017-08-15 Ang J. Li , Xiaochen Zhu , G. R. Stewart , Arthur F. Hebard

Two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising platforms for low dimensional superconductivity. However, in conventional intercalated systems, achieving a high superconducting transition temperature (Tc) often…

X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in CuxTiSe2 as a function of copper intercalation in order to clarify the relationship between the CDW and superconductivity. The results show a CDW…

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