scholarly journals Holographic imaging of the complex charge density wave order parameter

2019 ◽  
Vol 1 (3) ◽  
Author(s):  
Árpád Pásztor ◽  
Alessandro Scarfato ◽  
Marcello Spera ◽  
Céline Barreteau ◽  
Enrico Giannini ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Order Parameter ◽  
Density Wave ◽  
Holographic Imaging

Atomic-scale mapping of pressure-induced deformations and phase defects in the charge density wave order parameter

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
M. K. Kinyanjui ◽  
J. Ebad-Allah ◽  
M. Krottenmüller ◽  
C. A. Kuntscher
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Order Parameter ◽  
Density Wave ◽  
Atomic Scale

Elastic properties of the charge density wave system HoTe3

2018 ◽  
Vol 32 (23) ◽  
pp. 1850249 ◽  
Author(s):  
M. Saint-Paul ◽  
C. Guttin ◽  
P. Lejay ◽  
O. Leynaud ◽  
P. Monceau
Keyword(s):  
Phase Transition ◽  
Charge Density ◽  
Temperature Dependence ◽  
Charge Density Wave ◽  
Order Parameter ◽  
Density Wave ◽  
Wave System ◽  
Ultrasonic Measurements ◽  
Lower Charge ◽  
Charge Density Wave Phase

We present ultrasonic measurements on the rare earth tritelluride HoTe3 compound. Different anomalies are observed at the upper and lower charge density wave phase transition T[Formula: see text] = 284 K and T[Formula: see text] = 120 K. A striking T2 temperature dependence of the velocities of the longitudinal C[Formula: see text], C[Formula: see text] and shear C[Formula: see text] modes is observed in the ordered phase below the lower CDW phase transition T[Formula: see text]. Such a behavior is related to the temperature dependence of the CDW order parameter.

Incommensurate modulated phases of the NbxTa1-xTe4 charge density wave system

1992 ◽  
Vol 50 (1) ◽  
pp. 58-59
Author(s):  
S. Ritchie ◽  
J. C. Bennett ◽  
A. Prodan ◽  
F.W. Boswell ◽  
J.M. Corbett
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Direct Evidence ◽  
Density Wave ◽  
Wave System ◽  
Modulated Phases ◽  
Metal Atoms ◽  
Incommensurate Modulation ◽  
End Members ◽  
Modulation Wave Vector

A continuous sequence of compounds having composition NbxTa1-xTe4; 0 ≤ x ≤ 1 have been studied by electron diffraction and microscopy. Previous studies have shown that the end members of the series, TaTε4 and NbTε4 possess a quasi-one-dimensional character and exhibit charge density wave (CDW) distortions. In these compounds, the subcell structure is tetragonal with axes (a × a × c) and consists of the metal atoms (Nb or Ta) centered within an extended antiprismatic cage of Te atoms. At room temperature, TaTε4 has a commensurate modulation structure with a 2a × 2a × 3c unit cell. In NbTε4, an incommensurate modulation with × ∼ 16c axes is observed. Preliminary studies of the mixed compounds NbxTα1-xTε4 showed a discontinuous jump of the modulation wave vector commensurate to incommensurate when the Nb dopant concentration x, exceeded x ≃ 0.3, In this paper, the nature of the compositional dependence of is studied in greater detail and evidence is presented for a stepwise variation of . This constitutes the first direct evidence for a Devil's staircase in CDW materials.

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