scholarly journals Evidence for strongly coupled charge-density-wave ordering in three-dimensionalR5Ir4Si10compounds from optical measurements

2009 ◽  
Vol 80 (3) ◽  
Author(s):  
Riccardo Tediosi ◽  
Fabrizio Carbone ◽  
A. B. Kuzmenko ◽  
J. Teyssier ◽  
D. van der Marel ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Optical Measurements ◽  
Strongly Coupled

scholarly journals Coherent dynamics of the charge density wave gap in tritellurides

2014 ◽  
Vol 171 ◽  
pp. 299-310 ◽  
Author(s):  
L. Rettig ◽  
J.-H. Chu ◽  
I. R. Fisher ◽  
U. Bovensiepen ◽  
M. Wolf
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Coherent Control ◽  
Energy Gap ◽  
Electronic Band Structure ◽  
Density Wave ◽  
Electronic Band ◽  
Strongly Coupled ◽  
Pulse Pump ◽  
Amplitude Mode

The dynamics of the transient electronic structure in the charge density wave (CDW) system RTe3 (R = rare-earth element) is studied using time- and angle-resolved photoemission spectroscopy (trARPES). Employing a three-pulse pump–probe scheme we investigate the effect of the amplitude mode oscillations on the electronic band structure and, in particular, on the CDW energy gap. We observe coherent oscillations in both lower and upper CDW band with opposite phases, whereby two dominating frequencies are modulating the CDW order parameter. This demonstrates the existence of more than one collective amplitude mode, in contrast to a simple Peierls model. Coherent control experiments of the two amplitude modes, which are strongly coupled in equilibrium, demonstrate independent control of the modes suggesting a decoupling of both modes in the transient photoexcited state.

Strongly coupled charge-density wave transition in single-crystalLu5Ir4Si10

1999 ◽  
Vol 59 (11) ◽  
pp. 7266-7269 ◽  
Author(s):  
B. Becker ◽  
N. G. Patil ◽  
S. Ramakrishnan ◽  
A. A. Menovsky ◽  
G. J. Nieuwenhuys ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Strongly Coupled

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.

Wave Analysis of the Charge Density Wave Dynamics in the Molecular Conductor (Perylene)2Pt(mnt)2 (mnt=maleonitriledithiolate)

1995 ◽  
Vol 5 (5) ◽  
pp. 539-545 ◽  
Author(s):  
J. Dumas ◽  
N. Thirion ◽  
M. Almeida ◽  
E. B. Lopes ◽  
M. J. Matos ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Analysis ◽  
Wave Dynamics ◽  
Molecular Conductor

Tunneling spectroscopy in the Charge-Density Wave conductor NbSe3

2004 ◽  
Vol 114 ◽  
pp. 135-136 ◽  
Author(s):  
E. Slot ◽  
K. O'Neill ◽  
H. S.J. van der Zant ◽  
R. E. Thorne
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Tunneling Spectroscopy

CHARGE DENSITY WAVE DYNAMICS IN THE INCOMMENSURATE AND COMMENSURATE TaS3

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1639-C3-1645 ◽  
Author(s):  
P. Monceau ◽  
H. Salva ◽  
Z. Z. Wang
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Dynamics
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