scholarly journals Resonant electronic Raman scattering near a quantum critical point

2005 ◽  
Vol 359-361 ◽  
pp. 705-707 ◽  
Author(s):  
A.M. Shvaika ◽  
O. Vorobyov ◽  
J.K. Freericks ◽  
T.P. Devereaux
Keyword(s):  
Raman Scattering ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Electronic Raman Scattering ◽  
Quantum Critical

scholarly journals Nematic fluctuations in the cuprate superconductor Bi2Sr2CaCu2O8+δ

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
N. Auvray ◽  
B. Loret ◽  
S. Benhabib ◽  
M. Cazayous ◽  
R. D. Zhong ◽  
...  
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Van Hove Singularity ◽  
Superconducting Cuprates ◽  
Unconventional Superconductors ◽  
Pseudogap Phase ◽  
Electronic Raman Scattering ◽  
Quantum Critical ◽  
Canonical Quantum ◽  
Metal Phases

AbstractEstablishing the presence and the nature of a quantum critical point in their phase diagram is a central enigma of the high-temperature superconducting cuprates. It could explain their pseudogap and strange metal phases, and ultimately their high superconducting temperatures. Yet, while solid evidences exist in several unconventional superconductors of ubiquitous critical fluctuations associated to a quantum critical point, in the cuprates they remain undetected until now. Here using symmetry-resolved electronic Raman scattering in the cuprate $${\mathrm{Bi}}_2{\mathrm{Sr}}_2{\mathrm{CaCu}}_2{\mathrm{O}}_{8+\delta}$$Bi2Sr2CaCu2O8+δ, we report the observation of enhanced electronic nematic fluctuations near the endpoint of the pseudogap phase. While our data hint at the possible presence of an incipient nematic quantum critical point, the doping dependence of the nematic fluctuations deviates significantly from a canonical quantum critical scenario. The observed nematic instability rather appears to be tied to the presence of a van Hove singularity in the band structure.

scholarly journals Tuning the charge density wave quantum critical point and the appearance of superconductivity in TiSe2

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Sangyun Lee ◽  
Tae Beom Park ◽  
Jihyun Kim ◽  
Soon-Gil Jung ◽  
Won Kyung Seong ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Lattice-shifted nematic quantum critical point in FeSe1−xSx

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Chibani ◽  
D. Farina ◽  
P. Massat ◽  
M. Cazayous ◽  
A. Sacuto ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Critical Point ◽  
Degrees Of Freedom ◽  
Quantum Critical Point ◽  
Substantial Effect ◽  
Low Energy ◽  
Elastic Coupling ◽  
Superconducting Transition ◽  
Local Moments ◽  
Quantum Critical

AbstractWe report the evolution of nematic fluctuations in FeSe1−xSx single crystals as a function of Sulfur content x across the nematic quantum critical point (QCP) xc ~ 0.17 via Raman scattering. The Raman spectra in the B1g nematic channel consist of two components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers. Curie–Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling, which shifts the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is attributed to the dual aspect of electronic degrees of freedom in Hund’s metals, with both itinerant carriers and local moments contributing to the nematic susceptibility.

scholarly journals Avoided ferromagnetic quantum critical point in pressurized La5Co2Ge3

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
Li Xiang ◽  
Elena Gati ◽  
Sergey L. Bud'ko ◽  
Scott M. Saunders ◽  
Paul C. Canfield
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe 3− x Se x

2016 ◽  
Vol 25 (7) ◽  
pp. 077403
Author(s):  
Shan Cui ◽  
Lan-Po He ◽  
Xiao-Chen Hong ◽  
Xiang-De Zhu ◽  
Cedomir Petrovic ◽  
...  
Keyword(s):  
Charge Density ◽  
Critical Point ◽  
Charge Density Wave ◽  
Density Wave ◽  
Quantum Critical Point ◽  
Quantum Critical

scholarly journals Thermal Conductivity through the Quantum Critical Point inYbRh2Si2at Very Low Temperature

2015 ◽  
Vol 115 (4) ◽  
Author(s):  
M. Taupin ◽  
G. Knebel ◽  
T. D. Matsuda ◽  
G. Lapertot ◽  
Y. Machida ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Critical ◽  
Very Low Temperature

Unconventional superconductivity near quantum critical point revealed by Co-NQR measurements on

2007 ◽  
Vol 68 (11) ◽  
pp. 2119-2123 ◽  
Author(s):  
Y. Ihara ◽  
H. Takeya ◽  
K. Ishida ◽  
C. Michioka ◽  
K. Yoshimura ◽  
...  
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Unconventional Superconductivity ◽  
Quantum Critical
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