scholarly journals Cooper Pair-Like Systems at High Temperature and their Role on Fluctuations Near the Critical Temperature

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3216-3219 ◽  
Author(s):  
M. Ausloos ◽  
S. Dorbolo
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Critical Temperature ◽  
Oxygen Diffusion ◽  
Cooper Pair ◽  
Anomalous Behavior ◽  
Anomalous Effect ◽  
Linear Temperature ◽  
Ybco Sample

A logarithmic behavior is hidden in the linear temperature regime of the electrical resistivity R(T) of some YBCO sample below 2T c where "pairs" break apart, fluctuations occur and "a gap is opening". An anomalous effect also occurs near 200 K in the normal state Hall coefficient. In a simulation of oxygen diffusion in planar 123 YBCO, an anomalous behavior is found in the oxygen-vacancy motion near such a temperature. We claim that the behavior of the specific heat above and near the critical temperature should be reexamined in order to show the influence and implications of fluctuations and dimensionality on the nature of the phase transition and on the true onset temperature.

Phase transition regulation and piezoelectric performance optimization of fresnoite crystal for high temperature acceleration sensing

2021 ◽  
Author(s):  
Chao Jiang ◽  
Caizi Zhang ◽  
Fangfei Li ◽  
Li Sun ◽  
Yanlu Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Performance Optimization ◽  
Elevated Temperatures ◽  
Piezoelectric Response ◽  
Potential Candidate ◽  
High Electrical Resistivity ◽  
Sensing Applications ◽  
Piezoelectric Performance

Fresnoite crystal, Ba2TiSi2O8 (BTS), is a potential candidate for high temperature piezoelectric sensing applications, due to high electrical resistivity and strong piezoelectric response at elevated temperatures. However, anomalies of electro-elastic...

Thermal fluctuations near a phase transition probed through the electrical resistivity of high-temperature superconductors

2010 ◽  
Vol 78 (3) ◽  
pp. 310-316
Author(s):  
Noelia Cotón ◽  
Francisco J. Guzmán ◽  
Manuel V. Ramallo ◽  
Alexandre Ríos ◽  
Carolina Torrón ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Thermal Fluctuations

scholarly journals Can axial U(1) anomaly disappear at high temperature?

2018 ◽  
Vol 175 ◽  
pp. 01012 ◽  
Author(s):  
Hidenori Fukaya
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Critical Temperature ◽  
Lattice Qcd ◽  
Chiral Symmetry ◽  
Symmetry Violation ◽  
Simulation Data ◽  
Strong Suppression ◽  
Chiral Phase ◽  
Numerical Evidence

In our recent study of two-flavor lattice QCD using chiral fermions, we find strong suppression of axial U(1) anomaly above the critical temperature of chiral phase transition. Our simulation data also indicate suppression of topological susceptibility. In this talk, we present both of our theoretical and numerical evidence for disappearance of axial U(1) anomaly, emphasizing the importance of controlling lattice chiral symmetry violation, which is enhanced at high temperature.

La physique de la matière hadronique à haute température telle que décrite par la chromodynamique quantique sur réseau espace–temps

1989 ◽  
Vol 67 (12) ◽  
pp. 1228-1249 ◽  
Author(s):  
Jean Potvin
Keyword(s):  
Phase Transition ◽  
Numerical Simulation ◽  
High Temperature ◽  
Critical Temperature ◽  
Quantum Chromodynamics ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Heavy Quarks ◽  
Hadronic Matter ◽  
The Past

The numerical simulation of quantum chromodynamics on a space–time lattice allows for the calculation of many properties of hadronic matter at high temperature in a direct and in a nonperturbative fashion. This paper will be a review of the calculation techniques and results published in the past 5 years. Among other things, I will discuss the order of the phase transition, the critical temperature, the force between heavy quarks, as well as the thermodynamics and the spectroscopy of the quark–gluon plasma.

A STUDY OF QUARK-HADRON PHASE TRANSITION

1995 ◽  
Vol 10 (29) ◽  
pp. 4179-4185 ◽  
Author(s):  
B. CHAKRABARTI ◽  
T.L. REMA DEVI ◽  
A. BHATTACHARYA
Keyword(s):  
Phase Transition ◽  
Critical Temperature ◽  
Landau Theory ◽  
Anomalous Behavior ◽  
Ginzburg Landau ◽  
Hadron Phase ◽  
Theory Of Superconductivity

The anomalous behavior of the thermodynamic co-ordinates along with the hadronic critical temperature (Tc) is studied and the properties of the surrounding vacuum are investigated in the framework of the Ginzburg-Landau theory of superconductivity, with interesting conclusions.

A44_ Effect of Nano-Sized ZnO on Electrical & Structural Properties of High Temperature Tl2-x HgxBa2Ca2Cu3O10-δ Superconductors

2014 ◽  
Vol 925 ◽  
pp. 436-441
Author(s):  
Sabah Jalal Fathi
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Critical Temperature ◽  
Structural Properties ◽  
High Temperature Superconductivity ◽  
Type Structure ◽  
X Ray Diffraction ◽  
Nano Zno ◽  
X Ray ◽  
Tetragonal Type

The electrical resistivity of high temperature superconductivity Tl2-xHgxBa2Ca2Cu3O10-δhas been measured in the temperature range from 90K to 330K. These results showed that the critical temperature of the zero resistivity increases from 127K to 138K ,when the Hg concentration increased from 0 to 0.5. The structure of the Tl2-xHgxBa2Ca2Cu3O10-δcompound has also investigated by using X- ray diffraction technique. This compound has tetragonal type structure with a=b=5.36A & c=36.09A and the magnitude of c-axis increases to 37.8A when x increased to 0.5. Nano ZnO was add to the sample with concentration (0-1) wt% of the ( Tl2-xHgxBa2Ca2Cu3O10-δ) samples mass. The effect of the nano ZnO concentration substitution on the samples investigated on structure and critical temperature of the best sample properties (when x=0.5)and showed that the structure remains tetragonal and c-axis increased to 39.2A when nano sized concentration 0.8% and Tcincrease to 146K but c-axis decreased to 38.4A and Tcdecreased to 143K when the ZnO concentration 1%.

The Electrical Conductance of Some Alkali- and Divalent Transition Metal TCNQ Salts

1978 ◽  
Vol 33 (3) ◽  
pp. 344-346 ◽  
Author(s):  
H. H. Afify ◽  
F. M. Abdel-Kerim ◽  
H. F. Aly ◽  
A. A. Shabaka
Keyword(s):  
Phase Transition ◽  
Activation Energy ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Transition Metal ◽  
Temperature Region ◽  
Electrical Conductance ◽  
Metal Cations ◽  
High Temperature Region ◽  
Transition Metal Cations

AbstractThe electrical resistivity of the tetracyanoquinodimethane salts of ten alkali and transition metal cations has been investigated at temperatures from 300 to 470 K. The measurements indicate a phase transition, the activation energy of conductance being smaller in the high temperature region. The nature of this phase transition is discussed.

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