Commensurate-incommensurate phase transition in chlorine monolayer chemisorbed on Ag(111): Direct observation of crowdion condensation into a domain-wall fluid

2011 ◽  
Vol 84 (20) ◽  
Author(s):  
B. V. Andryushechkin ◽  
V. V. Cherkez ◽  
B. Kierren ◽  
Y. Fagot-Revurat ◽  
D. Malterre ◽  
...  
Keyword(s):  
Phase Transition ◽  
Domain Wall ◽  
Direct Observation ◽  
Incommensurate Phase

Neutron inelastic scattering spectra of methane on graphite at the commensurate–incommensurate phase transition

1988 ◽  
Vol 66 (4) ◽  
pp. 557-561 ◽  
Author(s):  
R. P. Humes ◽  
M. V. Smalley ◽  
T. Rayment ◽  
R. K. Thomas
Keyword(s):  
Phase Transition ◽  
Domain Wall ◽  
Inelastic Scattering ◽  
Low Frequency ◽  
Incommensurate Phase ◽  
Wall Structure ◽  
Neutron Inelastic Scattering ◽  
Scattering Spectra ◽  
Domain Wall Structure ◽  
Floating Phase

Neutron scattering spectra associated with rotational tunnelling and low frequency vibrations of CH4 adsorbed on graphite at 4 K and coverages from 0.2 to 1.5 monolayers are reported. Particular consideration is given to the changes which occur across the commensurate–incommensurate phase transition. It is shown that the incommensurate phase has a domain wall structure and is not a floating phase as had previously been proposed from theory.

Dynamics of the commensurate-incommensurate phase transition in C2O4D ND4, 1/2 D2O: a polarized Raman study under pressure

1993 ◽  
Vol 3 (4) ◽  
pp. 1007-1029 ◽  
Author(s):  
M. Krauzman ◽  
A. Colline ◽  
D. Kirin ◽  
R. M. Pick ◽  
N. Toupry
Keyword(s):  
Phase Transition ◽  
Incommensurate Phase ◽  
Raman Study ◽  
Polarized Raman

scholarly journals Direct observation of excitonic instability in Ta2NiSe5

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kwangrae Kim ◽  
Hoon Kim ◽  
Jonghwan Kim ◽  
Changil Kwon ◽  
Jun Sung Kim ◽  
...  
Keyword(s):  
Phase Transition ◽  
Direct Observation ◽  
Structural Phase ◽  
Temperature Phase ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Weiss Temperature ◽  
Excitonic Insulator ◽  
Electron Phonon Coupling ◽  
Low Temperature Phase

AbstractCoulomb attraction between electrons and holes in a narrow-gap semiconductor or a semimetal is predicted to lead to an elusive phase of matter dubbed excitonic insulator. However, direct observation of such electronic instability remains extremely rare. Here, we report the observation of incipient divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 using Raman spectroscopy. Critical fluctuations of the excitonic order parameter give rise to quasi-elastic scattering of B2g symmetry, whose intensity grows inversely with temperature toward the Weiss temperature of TW ≈ 237 K, which is arrested by a structural phase transition driven by an acoustic phonon of the same symmetry at TC = 325 K. Concurrently, a B2g optical phonon becomes heavily damped to the extent that its trace is almost invisible around TC, which manifests a strong electron-phonon coupling that has obscured the identification of the low-temperature phase as an excitonic insulator for more than a decade. Our results unambiguously reveal the electronic origin of the phase transition.

Incommensurate Phase Transition in a Thin Film

2011 ◽  
Vol 413 (1) ◽  
pp. 399-408 ◽  
Author(s):  
A. A. Mirkin ◽  
A. L. Pirozerskiĭ ◽  
E. V. Charnaya ◽  
Cheng Tien
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Incommensurate Phase

Direct observation of saw-tooth typed domain wall jumps in epitaxial ferromagnetic MnAs film on GaAs(001)

2007 ◽  
Vol 244 (12) ◽  
pp. 4495-4498
Author(s):  
Kwang-Su Ryu ◽  
Hiro Akinaga ◽  
Sung-Chul Shin
Keyword(s):  
Domain Wall ◽  
Direct Observation

Neutron diffraction studies of two-dimensional quantum systems

1987 ◽  
Vol 65 (11) ◽  
pp. 1435-1439 ◽  
Author(s):  
H. J. Lauter ◽  
H. P. Schildberg ◽  
H. Godfrin ◽  
H. Wiechert ◽  
R. Haensel
Keyword(s):  
Neutron Diffraction ◽  
Domain Wall ◽  
Quantum Systems ◽  
Incommensurate Phase ◽  
Two Dimensional

The phases of D2 monolayers on graphite between the commensurate and the incommensurate phase have been investigated by neutron diffraction, revealing new features including domain-wall constructions. For the related systems, 3He and 4He adsorbed on graphite, the structure of the solid first and second layers and the interaction between them have been analyzed.

Test of Critical Behaviour Through the Order Parameter-Entropy Relation in the Normal-Incommensurate Phase Transition of Rb 2 ZnCl 4

2002 ◽  
Vol 270 (1) ◽  
pp. 351-356
Author(s):  
J. M. Martín-Olalla ◽  
M. C. Gallardo ◽  
S. Ramos ◽  
J. M. Perez-Mato ◽  
E. K. H. Salje
Keyword(s):  
Phase Transition ◽  
Order Parameter ◽  
Incommensurate Phase ◽  
Critical Behaviour ◽  
Entropy Relation
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