Phonon Dispersion and Electronic Structure In Quasi-one- Dimensional Layered Ta2NiSe7 Single Crystal

2020 ◽  
Author(s):  
Haiping Chen ◽  
Zhongti Sun
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Single Crystal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Phonon Dispersion ◽  
Density Wave ◽  
Layered Systems ◽  
One Dimensional ◽  
Fermi Surface Nesting

The formation mechanism of charge density wave (CDW) order in layered systems was belived to arise from phonon-electron coupling and electronic structure instability induced by Fermi surface nesting. Herein, we...

scholarly journals Electronic nature of charge density wave and electron-phonon coupling in kagome superconductor KV3Sb5

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Hailan Luo ◽  
Qiang Gao ◽  
Hongxiong Liu ◽  
Yuhao Gu ◽  
Dingsong Wu ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Phonon Coupling ◽  
Electronic Nature ◽  
Electron Phonon Coupling ◽  
Gap Opening ◽  
Fermi Surface Reconstruction

AbstractThe Kagome superconductors AV3Sb5 (A = K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in AV3Sb5. High-precision electronic structure determination is essential to understand its origin. Here we unveil electronic nature of the CDW phase in our high-resolution angle-resolved photoemission measurements on KV3Sb5. We have observed CDW-induced Fermi surface reconstruction and the associated band folding. The CDW-induced band splitting and the associated gap opening have been revealed at the boundary of the pristine and reconstructed Brillouin zones. The Fermi surface- and momentum-dependent CDW gap is measured and the strongly anisotropic CDW gap is observed for all the V-derived Fermi surface. In particular, we have observed signatures of the electron-phonon coupling in KV3Sb5. These results provide key insights in understanding the nature of the CDW state and its interplay with superconductivity in AV3Sb5 superconductors.

QUASI-ONE-DIMENSIONAL SUPERCONDUCTIVITY IN Sc5Ir4Si10 AND Lu5Ir4Si10 SINGLE CRYSTALS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3334-3339 ◽  
Author(s):  
T. TAMEGAI ◽  
G. J. LI
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Single Crystals ◽  
Charge Density Wave ◽  
Density Wave ◽  
Anisotropy Parameter ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Subtle Difference ◽  
One Dimensional

Anisotropic superconducting properties in Sc 5 Ir 4 Si 10 and Lu 5 Ir 4 Si 10 single crystals are investigated. Both of these compounds are found to show quasi-one-dimensional superconductivity with better conduction along the c-axis and anisotropy parameter of about 2. Reflecting the partial destruction of the Fermi surface due to charge-density-wave formation, Lu 5 Ir 4 Si 10 shows higher residual resistivity, lower superconducting transition temperature, and longer magnetic penetration depths compared with those of Sc 5 Ir 4 Si 10. Similarity of superconducting properties including the anisotropy in Sc 5 Ir 4 Si 10 and Lu 5 Ir 4 Si 10 indicates that the absence of the charge-density wave in Sc 5 Ir 4 Si 10 is controlled by a subtle difference in the Fermi surface topologies in these two compounds.

Thermopower behavior inLa2Mo2O7: A possible charge-density-wave system with partial Fermi-surface nesting

1989 ◽  
Vol 40 (13) ◽  
pp. 9312-9314 ◽  
Author(s):  
K. Surendranath ◽  
C. Bansal ◽  
M. Greenblatt ◽  
W. H. McCarroll
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave System ◽  
Fermi Surface Nesting

scholarly journals Fermi surface nesting and charge-density wave formation in rare-earth tritellurides

2005 ◽  
Vol 71 (8) ◽  
Author(s):  
J. Laverock ◽  
S. B. Dugdale ◽  
Zs. Major ◽  
M. A. Alam ◽  
N. Ru ◽  
...  
Keyword(s):  
Rare Earth ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Formation ◽  
Fermi Surface Nesting

scholarly journals Electronic Nature of Charge Density Wave and Electron-Phonon Coupling in Kagome Superconductor KV3Sb5

2021 ◽  
Author(s):  
Xingjiang Zhou ◽  
Hai-Lan Luo ◽  
Qiang Gao ◽  
Hongxiong Liu ◽  
Yuhao Gu ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Anomalous Hall Effect ◽  
Phonon Coupling ◽  
Electronic Nature ◽  
Electron Phonon Coupling ◽  
The Impact

Abstract The Kagome superconductors AV3Sb5 (A=K, Rb, Cs) have received enormous attention due to their nontrivial topological electronic structure, anomalous physical properties and superconductivity. Unconventional charge density wave (CDW) has been detected in AV3Sb5 that is found to be intimately intertwined with the anomalous Hall effect and superconductivity. High-precision electronic structure determination is essential to understand the origin of the CDW transition and its interplay with electron correlation, topology and superconductivity, yet, little evidence has been found about the impact of the CDW state on the electronic structure in AV3Sb5. Here we unveil electronic nature of the CDW phase in our high-resolution angle-resolved photoemission (ARPES) measurements on KV3Sb5. We have observed CDW-induced Fermi surface reconstruction and the associated band structure folding. The CDW-induced band splitting and the associated gap opening have been revealed at the boundary of the pristine and reconstructed Brillouin zone. The Fermi surface- and momentum-dependent CDW gap is measured for the first time and the strongly anisotropic CDW gap is observed for all the V-derived Fermi surface sheets. In particular, we have observed signatures of the electron-phonon coupling for all the V-derived bands. These results provide key insights in understanding the nature of the CDW state and its interplay with superconductivity in AV3Sb5 superconductors.

Hidden Fermi Surface Nesting and Charge Density Wave Instability in Low-Dimensional Metals

Science ◽  
1991 ◽  
Vol 252 (5002) ◽  
pp. 96-98 ◽  
Author(s):  
M. -H. WHANGBO ◽  
E. CANADELL ◽  
P. FOURY ◽  
J. -P. POUGET
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Wave Instability ◽  
Fermi Surface Nesting ◽  
Low Dimensional

Tunneling Spectra of NbSe3 in Magnetic Fields

1998 ◽  
Vol 12 (24) ◽  
pp. 1013-1019
Author(s):  
He Haifeng ◽  
Wang Yunping ◽  
Li Shanlin ◽  
Jing Xiunian ◽  
Li Guohong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fermi Surface ◽  
Charge Density ◽  
Applied Magnetic Field ◽  
Charge Density Wave ◽  
Density Wave ◽  
Mean Field ◽  
Fermi Surface Nesting ◽  
The Mean ◽  
Gap Parameter

The charge density wave gaps of NbSe 3 have been carefully determinated by tunneling spectroscopy. In contrast to earlier work, the gap parameter associated with the 59 K transition obtained in the present measurements is very close to the mean field value. The gap structures for both the 145 K and 59 K transitions are found to be essentially independent of the applied magnetic field H. The present findings strongly suggest that the anomalous magnetotransport properties of the material originate from some other mechanism than a H-induced improvement of Fermi surface nesting.

High-frequency, "quantum" and electromechanical effects in quasi-one-dimensional charge density wave conductors

2013 ◽  
Vol 183 (1) ◽  
pp. 33-54 ◽  
Author(s):  
Vadim Ya. Pokrovskii ◽  
Sergey G. Zybtsev ◽  
Maksim V. Nikitin ◽  
Irina G. Gorlova ◽  
Venera F. Nasretdinova ◽  
...  
Keyword(s):  
Charge Density ◽  
High Frequency ◽  
Charge Density Wave ◽  
Density Wave ◽  
One Dimensional ◽  
Electromechanical Effects
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