The Effect of Pressure on the Modulated Phases of TTF-TCNQ

1980 ◽  
pp. 415-421
Author(s):  
S. Megtert ◽  
R. Pynn ◽  
C. Vettier ◽  
R. Comès ◽  
A. F. Garito
Keyword(s):  
Effect Of Pressure ◽  
Modulated Phases

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.

Effect of pressure on structure and fluorescence of SrFCL: Sm2

1990 ◽  
Vol 3 (1) ◽  
pp. 144-146
Author(s):  
Y. R. Shen ◽  
T. Gregorian ◽  
Th. Tröster ◽  
O. Schulte ◽  
W. B. Holzapfel
Keyword(s):  
Effect Of Pressure

Effect of Pressure on the Fluctuations above a Burning Heterogeneous Propellant

2021 ◽  
Author(s):  
Mohammad Mehrabadi ◽  
Masoud Safdari ◽  
William Dick ◽  
Thomas L. Jackson
Keyword(s):  
Effect Of Pressure
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