scholarly journals Coexistence of resistance oscillations and the anomalous metal phase in a lithium intercalated TiSe2 superconductor

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Menghan Liao ◽  
Heng Wang ◽  
Yuying Zhu ◽  
Runan Shang ◽  
Mohsin Rafique ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Lithium Ion ◽  
Superconducting Transition ◽  
Metal Dichalcogenides ◽  
Ionic Solid ◽  
Quantum Phenomena ◽  
Magnetoresistance Oscillations ◽  
Ion Intercalation

AbstractSuperconductivity and charge density wave (CDW) appear in the phase diagram of a variety of materials including the high-Tc cuprate family and many transition metal dichalcogenides (TMDs). Their interplay may give rise to exotic quantum phenomena. Here, we show that superconducting arrays can spontaneously form in TiSe2–a TMD with coexisting superconductivity and CDW—after lithium ion intercalation. We induce a superconducting dome in the phase diagram of LixTiSe2 by using the ionic solid-state gating technique. Around optimal doping, we observe magnetoresistance oscillations, indicating the emergence of periodically arranged domains. In the same temperature, magnetic field and carrier density regime where the resistance oscillations occur, we observe signatures for the anomalous metal—a state with a resistance plateau across a wide temperature range below the superconducting transition. Our study not only sheds further insight into the mechanism for the periodic electronic structure, but also reveals the interplay between the anomalous metal and superconducting fluctuations.

scholarly journals Pressure-induced enhancement of the superconducting transition temperature in La2O2Bi3AgS6

2021 ◽  
Author(s):  
Esteban I. Paredes Aulestia ◽  
Xinyou Liu ◽  
Yiu Yung Pang ◽  
Chun Wa So ◽  
Wing Chi Yu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Charge Density Wave ◽  
Ambient Pressure ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Superconducting Transition ◽  
Resistivity Measurements ◽  
Maximum Value ◽  
Metal Dichalcogenides ◽  
Pressure Phase

Abstract 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 responsible for the pairing of electrons in these superconductors. However, this issue remains unclear and new systems are desired to provide a better picture. Here, we report the temperature-pressure phase diagram of a recently discovered BiS2 superconductor La2O2Bi3AgS6, which shows a possible CDW transition at T* ∽155 K and a superconducting transition at Tc ∽1.0 K at ambient pressure, via electrical resistivity measurements. Upon applying pressure, T* decreases linearly and extrapolates to 0 K at 3.9 GPa. Meanwhile, Tc is enhanced and reaches maximum value of 4.1 K at 3.1 GPa, forming a superconducting dome in the temperature-pressure phase diagram.

Enhanced Photocurrent Response Speed in Charge-Density-Wave Phase of TiSe2-Metal Junctions

Nanoscale ◽  
2021 ◽  
Author(s):  
Thayer Walmsley ◽  
Yaqiong Xu
Keyword(s):  
Carrier Mobility ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Response Speed ◽  
Charge Carrier Mobility ◽  
Metal Dichalcogenides ◽  
Charge Density Wave Phase ◽  
Large Sheet ◽  
High Charge Carrier Mobility ◽  
Significant Attention

Group IVB transition metal dichalcogenides (TMDCs) have attracted significant attention due to their predicted high charge carrier mobility, large sheet current density, and enhanced thermoelectric power. Here, we investigate the...

scholarly journals A potential all-electronic route to the charge-density-wave phase in monolayer vanadium diselenide

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Matthew J. Trott ◽  
Chris A. Hooley
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Coulomb Repulsion ◽  
Lattice Vibrations ◽  
Heisenberg Exchange ◽  
Low Energies ◽  
Metal Dichalcogenides ◽  
Charge Density Wave Phase

AbstractThe transition metal dichalcogenides offer significant promise for the tunable realisation and application of correlated electronic phases. However, tuning their properties requires an understanding of the physical mechanisms underlying their experimentally observed ordered phases, and in particular the extent to which lattice vibrations are a necessary ingredient. Here we present a potential mechanism for charge-density-wave formation in monolayers of vanadium diselenide in which the key role at low energies is played by a combination of electron–electron interactions and nesting. There is a competition between superconducting and density-wave fluctuations as sections of the Fermi surface are tuned to perfect nesting. This competition leads to charge-density-wave order when the effective Heisenberg exchange interaction is comparable to the effective Coulomb repulsion. When all effective interactions are purely repulsive, it results instead in d-wave superconductivity. We discuss the possible role of lattice vibrations in enhancing the effective Heisenberg exchange during the earlier stages of the renormalisation group flow.

scholarly journals W2C/WS2 Alloy Nanoflowers as Anode Materials for Lithium-Ion Storage

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1336 ◽  
Author(s):  
Thang Phan Nguyen ◽  
Il Tae Kim
Keyword(s):  
Electrochemical Performance ◽  
Anode Materials ◽  
Transition Metal Dichalcogenides ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Facile Hydrothermal Method ◽  
Initial Discharge ◽  
Ion Storage ◽  
Metal Dichalcogenides ◽  
Prepared Alloy

Recently, composites of MXenes and two-dimensional transition metal dichalcogenides have emerged as promising materials for energy storage applications. In this study, W2C/WS2 alloy nanoflowers (NFs) were prepared by a facile hydrothermal method. The alloy NFs showed a particle size of 200 nm–1 μm, which could be controlled. The electrochemical performance of the as-prepared alloy NFs was investigated to evaluate their potential for application as lithium-ion battery (LIB) anodes. The incorporation of W2C in the WS2 NFs improved their electronic properties. Among them, the W2C/WS2_4h NF electrode showed the best electrochemical performance with an initial discharge capacity of 1040 mAh g−1 and excellent cyclability corresponding to a reversible capacity of 500 mAh g−1 after 100 cycles compared to that of the pure WS2 NF electrode. Therefore, the incorporation of W2C is a promising approach to improve the performance of LIB anode materials.

Epitaxial Growth and Charge Density Wave of TaSe2

1991 ◽  
Vol 230 ◽  
Author(s):  
Toshihiro Shimada ◽  
Fumio S. Ohuchi ◽  
Bruce A. Parkinson
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Epitaxial Growth ◽  
Ultrathin Films ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Charge Density Waves ◽  
Density Waves ◽  
Metal Dichalcogenides

AbstractWe report an epitaxial growth of TaSe2, a family of transition metal dichalcogenides that exhibit Charge Density Waves (CDW). The films that have been characterized with RHEED, LEED, XPS and STM showed two different phases. Occurrence of CDW in the ultrathin films has been detected by XPS and LEED.

scholarly journals Atomic lattice disorder in charge-density-wave phases of exfoliated dichalcogenides (1T-TaS2)

2016 ◽  
Vol 113 (41) ◽  
pp. 11420-11424 ◽  
Author(s):  
Robert Hovden ◽  
Adam W. Tsen ◽  
Pengzi Liu ◽  
Benjamin H. Savitzky ◽  
Ismail El Baggari ◽  
...  
Keyword(s):  
Charge Density ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Charge Density Waves ◽  
Periodic Lattice ◽  
Atomic Lattice ◽  
Scanning Transmission ◽  
Out Of Plane ◽  
Metal Dichalcogenides ◽  
Layered Transition Metal

Charge-density waves (CDWs) and their concomitant periodic lattice distortions (PLDs) govern the electronic properties in several layered transition-metal dichalcogenides. In particular, 1T-TaS2 undergoes a metal-to-insulator phase transition as the PLD becomes commensurate with the crystal lattice. Here we directly image PLDs of the nearly commensurate (NC) and commensurate (C) phases in thin, exfoliated 1T-TaS2 using atomic resolution scanning transmission electron microscopy at room and cryogenic temperature. At low temperatures, we observe commensurate PLD superstructures, suggesting ordering of the CDWs both in- and out-of-plane. In addition, we discover stacking transitions in the atomic lattice that occur via one-bond-length shifts. Interestingly, the NC PLDs exist inside both the stacking domains and their boundaries. Transitions in stacking order are expected to create fractional shifts in the CDW between layers and may be another route to manipulate electronic phases in layered dichalcogenides.

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