Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1 T ‐VSe 2

2020 ◽  
Vol 6 (5) ◽  
pp. 1901427
Author(s):  
Jiajia Feng ◽  
Resta A. Susilo ◽  
Bencheng Lin ◽  
Wen Deng ◽  
Yanju Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Room Temperature ◽  
Density Wave ◽  
Transition Metal Dichalcogenide

Phase stability of transition metal dichalcogenide by competing ligand field stabilization and charge density wave

2D Materials ◽  
2015 ◽  
Vol 2 (3) ◽  
pp. 035019 ◽  
Author(s):  
Santosh K C ◽  
Chenxi Zhang ◽  
Suklyun Hong ◽  
Robert M Wallace ◽  
Kyeongjae Cho
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Phase Stability ◽  
Charge Density Wave ◽  
Density Wave ◽  
Ligand Field ◽  
Transition Metal Dichalcogenide

scholarly journals Negative differential resistance observed on the charge density wave of a transition metal dichalcogenide

Nanoscale ◽  
2019 ◽  
Vol 11 (46) ◽  
pp. 22351-22358 ◽  
Author(s):  
Adina Luican-Mayer ◽  
Yuan Zhang ◽  
Andrew DiLullo ◽  
Yang Li ◽  
Brandon Fisher ◽  
...  
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Voltage Pulse ◽  
Negative Differential Resistance ◽  
Charge Density Wave ◽  
Density Wave ◽  
Differential Resistance ◽  
Charge Density Waves ◽  
Transition Metal Dichalcogenide ◽  
Physical Phenomena

Charge density waves and negative differential resistance are seemingly unconnected physical phenomena but they coexist after a voltage pulse manipulation on TaS2 surface with an STM tip.

The Effects of Transition Metal Substitutions in the NbTe4-TaTe4 Charge-Density Wave System

1992 ◽  
Vol 45 (9) ◽  
pp. 1363 ◽  
Author(s):  
JC Bennett ◽  
FW Boswell ◽  
A Prodan ◽  
JM Corbett ◽  
S Ritchie
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Room Temperature ◽  
Density Wave ◽  
Dark Field ◽  
Wave System ◽  
Incommensurate Modulation ◽  
High Concentrations ◽  
A Charge

At room temperature, the structures of TaTe4 and NbTe4 are modulated by the presence of a charge-density wave which in the former compound is commensurate with the parent lattice and in the latter incommensurate. In addition, a series of incommensurate mixed crystals ( Tal-xNbx )Te4 (0 ≤ x ≤) exist in which the modulation wavevector increases as a function of x. In this paper, we report the occurrence of a systematic variation in the period of the charge-density wave upon substitution of the transition metal elements Ti, Zr or V for either Nb or Ta. Electron diffraction experiments reveal that, in TaTe4, substitutions of Group 4 elements Ti and Zr result in an incommensurate modulation with a decrease in the modulation wavevector q. In NbTe4, substitutions of Ti or Zr also reduce q, in this case towards the commensurate value, and, at sufficiently high concentrations, a commensurate phase is stabilized at room temperature. Vanadium substitutions in NbTe4 result in a slight increase in q. Satellite dark-field images reveal the presence of defects in the modulation structures of the doped crystals. The above results are discussed in terms of the factors which determine the charge-density wave periodicity in the NbTe4-TaTe4 system.

scholarly journals Novel Mechanism of a Charge Density Wave in a Transition Metal Dichalcogenide

2007 ◽  
Vol 99 (21) ◽  
Author(s):  
D. W. Shen ◽  
B. P. Xie ◽  
J. F. Zhao ◽  
L. X. Yang ◽  
L. Fang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Transition Metal Dichalcogenide ◽  
A Charge

scholarly journals Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuki Nakata ◽  
Katsuaki Sugawara ◽  
Ashish Chainani ◽  
Hirofumi Oka ◽  
Changhua Bao ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Charge Density ◽  
Electron Correlation ◽  
Charge Density Wave ◽  
Room Temperature ◽  
High Temperature Superconductivity ◽  
Density Wave ◽  
Mott Insulator ◽  
Transition Metal Dichalcogenide ◽  
A Charge

AbstractCombination of low-dimensionality and electron correlation is vital for exotic quantum phenomena such as the Mott-insulating phase and high-temperature superconductivity. Transition-metal dichalcogenide (TMD) 1T-TaS2 has evoked great interest owing to its unique nonmagnetic Mott-insulator nature coupled with a charge-density-wave (CDW). To functionalize such a complex phase, it is essential to enhance the CDW-Mott transition temperature TCDW-Mott, whereas this was difficult for bulk TMDs with TCDW-Mott < 200 K. Here we report a strong-coupling 2D CDW-Mott phase with a transition temperature onset of ~530 K in monolayer 1T-TaSe2. Furthermore, the electron correlation derived lower Hubbard band survives under external perturbations such as carrier doping and photoexcitation, in contrast to the bulk counterpart. The enhanced Mott-Hubbard and CDW gaps for monolayer TaSe2 compared to NbSe2, originating in the lattice distortion assisted by strengthened correlations and disappearance of interlayer hopping, suggest stabilization of a likely nonmagnetic CDW-Mott insulator phase well above the room temperature. The present result lays the foundation for realizing monolayer CDW-Mott insulator based devices operating at room temperature.

scholarly journals Survey of the Thermodynamic Properties of the Charge Density Wave Systems

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
M. Saint-Paul ◽  
P. Monceau
Keyword(s):  
Phase Transition ◽  
Transition Metal ◽  
Thermodynamic Properties ◽  
Charge Density ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Charge Density Wave ◽  
Mean Field Theory ◽  
Density Wave ◽  
Transition Metal Dichalcogenide

We reexamine the thermodynamic properties such as specific heat, thermal expansion, and elastic constants at the charge density wave (CDW) phase transition in several one- and two-dimensional materials. The amplitude of the specific heat anomaly at the CDW phase transition TCDW increases with increasing TCDW and a tendency to a lineal temperature dependence is verified. The Ehrenfest mean field theory relationships are approximately satisfied by several compounds such as the rare earth tritelluride compound TbTe3, transition metal dichalcogenide compound 2H-NbSe2, and quasi-one-dimensional conductor K0.3MoO3. In contrast inconsistency exists in the Ehrenfest relationships with the transition metal dichalcogenide compounds 2H-TaSe2 and TiSe2 having a different thermodynamic behavior at the transition temperature TCDW. It seems that elastic properties in the ordered phase of most of the compounds are related to the temperature dependence of the order parameter which follows a BCS behavior.

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