THE STRAIN QUANTUM CRITICAL POINT FOR SUPERSTRIPES IN THE PHASE DIAGRAM OF ALL CUPRATE PEROVSKITES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3342-3355 ◽  
Author(s):  
A. BIANCONI ◽  
N. L. SAINI ◽  
S. AGRESTINI ◽  
D. DI CASTRO ◽  
G. BIANCONI
Keyword(s):  
Critical Temperature ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Metallic Phase ◽  
X Ray Diffraction ◽  
Critical Fluctuations ◽  
Local Lattice ◽  
Lattice Distortions ◽  
Quantum Critical ◽  
Function Of Two Variables

The metallic phase in doped cuprate perovskites is determined by both the hope doping δ and the micro-strain ε of the planar Cu-O bond length. The micro-strain ε in the CuO 2 plane has been measured by Cu K-edge EXAFS and x-ray diffraction using synchrotron radiation. The critical micro-strain ε c for the onset of local lattice distortions (LLD) and stripe formation has been determined. The strain quantum critical point (QCP) is found at (ε c ,δ c ). The superconducting critical temperature is measured as a function of two variables T c (ε,δ) and it reaches its maximum at the strain QCP. The superconducting phase occurs in the region of critical fluctuations around this QCP. The critical fluctuations near the strain QCP drives the self-organization of the metallic plane forming a particular superlattice of quantum stripes called "superstripes" that favors the amplification of the superconducting critical temperature.

scholarly journals Quantum critical scaling and fluctuations in Kondo lattice materials

2017 ◽  
Vol 114 (24) ◽  
pp. 6250-6255 ◽  
Author(s):  
Yi-feng Yang ◽  
David Pines ◽  
Gilbert Lonzarich
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Kondo Lattice ◽  
Critical Scaling ◽  
Critical Fluctuations ◽  
Lattice Materials ◽  
Heavy Electron ◽  
Logarithmic Scaling ◽  
Quantum Critical ◽  
Quantum Critical Scaling

We propose a phenomenological framework for three classes of Kondo lattice materials that incorporates the interplay between the fluctuations associated with the antiferromagnetic quantum critical point and those produced by the hybridization quantum critical point that marks the end of local moment behavior. We show that these fluctuations give rise to two distinct regions of quantum critical scaling: Hybridization fluctuations are responsible for the logarithmic scaling in the density of states of the heavy electron Kondo liquid that emerges below the coherence temperature T∗, whereas the unconventional power law scaling in the resistivity that emerges at lower temperatures below TQC may reflect the combined effects of hybridization and antiferromagnetic quantum critical fluctuations. Our framework is supported by experimental measurements on CeCoIn5, CeRhIn5, and other heavy electron materials.

ANISOTROPIC IN PLAIN Cu-O STRAIN AND THE STRIPE QUANTUM CRITICAL POINT IN YBa2Cu3O6+k

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3668-3672 ◽  
Author(s):  
S. SANNA ◽  
P. MANCA ◽  
S. AGRESTINI ◽  
N. L. SAINI ◽  
A. BIANCONI
Keyword(s):  
Critical Temperature ◽  
Critical Point ◽  
Critical Strain ◽  
Quantum Critical Point ◽  
Temperature Scales ◽  
Quantum Critical

Anisotropic Cu-O strain has been measured and a relation between the superconducting critical temperature and the strain is studied in the YBa 2 Cu 3 O 6+ k (Y123). oxygen ordered YBa 2 Cu 3 O 6+ k phases. We show that the critical temperature scales both with the strain along the a axis (ε a ,) and along the b axis (ε b ). While undoped, the system is close to the critical strain, ε c ~ 0.043. The formation of chains with doping gives rise to a decrease of the ε b to take the system away from the critical point approaching the dynamical quantum stripe fluctuations (ε b <ε c ) and the ε a increases to approach the phase of superconducting stripes (ε a >ε c ).

scholarly journals Superconductivity and non-Fermi liquid behavior near a nematic quantum critical point

2017 ◽  
Vol 114 (19) ◽  
pp. 4905-4910 ◽  
Author(s):  
Samuel Lederer ◽  
Yoni Schattner ◽  
Erez Berg ◽  
Steven A. Kivelson
Keyword(s):  
Critical Point ◽  
Transition Metal Oxides ◽  
Quantum Monte Carlo ◽  
Fermi Liquid ◽  
Quantum Critical Point ◽  
Low Frequency ◽  
Critical Fluctuations ◽  
Liquid Behavior ◽  
Quantum Critical ◽  
Fermi Liquid Behavior

Using determinantal quantum Monte Carlo, we compute the properties of a lattice model with spin 12 itinerant electrons tuned through a quantum phase transition to an Ising nematic phase. The nematic fluctuations induce superconductivity with a broad dome in the superconducting Tc enclosing the nematic quantum critical point. For temperatures above Tc, we see strikingly non-Fermi liquid behavior, including a “nodal–antinodal dichotomy” reminiscent of that seen in several transition metal oxides. In addition, the critical fluctuations have a strong effect on the low-frequency optical conductivity, resulting in behavior consistent with “bad metal” phenomenology.

scholarly journals Possible quantum fluctuations in the vicinity of the quantum critical point of (Sr,Ca)3Ir4Sn13 revealed by high-energy x-ray diffraction

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
L. S. I. Veiga ◽  
J. R. L. Mardegan ◽  
M. v. Zimmermann ◽  
D. T. Maimone ◽  
F. B. Carneiro ◽  
...  
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Fluctuations ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Quantum Critical

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
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