SUPERSTRIPES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3289-3297 ◽  
Author(s):  
A. BIANCONI
Keyword(s):  
Critical Temperature ◽  
Fermi Level ◽  
Critical Point ◽  
Room Temperature ◽  
Quantum Critical Point ◽  
Single Electrons ◽  
Self Organized ◽  
Atomic Limit ◽  
De Broglie Wavelength ◽  
Short Time

A superconducting superlattice of quantum stripes with a particular shape that gives the amplification of the critical temperature is called "superstripes". This superlattice is characterized by: a) the metallic stripe width L of the order of the de Broglie wavelength of electrons at the Fermi level, L ~λ F , and b) the hopping of pairs between the stripes larger than the hopping of single electrons. "Superstripes" can be realized artificially to get new room temperature superconductors (RTS). This particular mesoscopic heterostructure at the atomic limit has been found as a self organized network of charges, in a short time and space scale, in doped cuprate perovskites near the micro-strain quantum critical point for "superstripes" formation.

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 ).

CRITICAL SHORT-TIME DYNAMICS IN LATTICE GAUGE THEORY

2006 ◽  
Vol 17 (01) ◽  
pp. 1-13 ◽  
Author(s):  
TSUYOSHI OTOBE ◽  
KEISUKE OKANO
Keyword(s):  
Gauge Theory ◽  
Critical Temperature ◽  
Critical Point ◽  
Critical Exponents ◽  
Lattice Gauge Theory ◽  
Time Relaxation ◽  
Time Dynamics ◽  
Lattice Gauge ◽  
Time Scaling ◽  
Short Time

We investigated a critical short-time relaxation in a lattice gauge theory. A systematic procedure of estimating critical point based on the "short-time scaling" is formulated. It is applied to the (2+1)-dimensional SU(2) lattice gauge theory at finite temperature to deduce its critical point. Finally, we studied the short-time relaxation behavior at the critical temperature starting either from "cold" and "hot" initial configuration, and calculated the dynamic critical exponents θ and z, as well as the static exponents β/ν.

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.

The sensitive tunability of superconducting critical temperature in high-buckled plumbene by shifting Fermi level

2021 ◽  
Vol 130 ◽  
pp. 114688
Author(s):  
Binyuan Zhang ◽  
Fei Guo ◽  
Mingfeng Zhu ◽  
Lanting Feng ◽  
Yisong Zheng
Keyword(s):  
Critical Temperature ◽  
Fermi Level

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 Investigation of single-domain Au silicide nanowires on Si(110) formed for Au coverages in the monolayer regime

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Stephan Appelfeller
Keyword(s):  
Fermi Level ◽  
Surface Structure ◽  
Density Of States ◽  
The Self ◽  
Single Domain ◽  
Photoemission Spectroscopy ◽  
Annealing Temperatures ◽  
Self Organized ◽  
Scanning Tunnelling ◽  
Tunnelling Microscopy

AbstractThe self-organized formation of single domain Au silicide nanowires is observed on Si(110). These nanowires are analysed using scanning tunnelling microscopy (STM) and spectroscopy (STS) as well as photoemission spectroscopy (PES). Core-level PES is utilised to confirm the formation of Au silicide and establish its presence as the top most surface structure, i.e., the nanowires. The growth of the Au silicide nanowires and their dimensions are studied by STM. They form for Au coverages of about 1 monolayer and are characterized by widths of about 2 to 3 nm and heights below 1 nm while reaching lengths exceeding 500 nm when choosing appropriate annealing temperatures. Valence band PES and STS indicate a small but finite density of states at the Fermi level typical for compound metals.

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.

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