Study of magnetic, nematic and superconducting properties of iron-based high-temperature superconductors: Variational cluster approximation

2018 ◽  
Author(s):  
Y. V. Zumagulov ◽  
V. D. Neverov ◽  
A. E. Lukyanov ◽  
A. V. Krasavin
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Properties ◽  
Cluster Approximation ◽  
Iron Based ◽  
Variational Cluster Approximation

Structural and Superconducting Properties of RE1 - 2xPrxCaxSr0.8Ba1.2Cu3O7 - δ (RE = Er and Gd) High Tc Superconductors

2003 ◽  
Vol 17 (13) ◽  
pp. 2609-2622 ◽  
Author(s):  
N. Charoenthai ◽  
P. Winotai ◽  
R. Suryanarayanan ◽  
I. M. Tang
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Transition Temperature ◽  
Size Effect ◽  
High Temperature Superconductors ◽  
Superconducting Properties ◽  
High Tc Superconductors ◽  
High Tc ◽  
Oxygen Annealing ◽  
Ion Size

We report here on the structural and superconducting properties of RE 1 - 2x Pr x Ca x Sr 0.8 Ba 1.2 Cu 3 O 7 - δ (RE = Er and Gd, 0 ≤ x ≤ 0.2) high temperature superconductors. The transition temperature (Tc) of these compounds decreases when the Pr and Ca concentrations are increased. At constant Pr and Ca concentrations, the Tc of Er 1 - 2x Pr x Ca x Sr 0.8 Ba 1.2 Cu 3 O 7 - δ superconductor system is higher than that observed for the Gd 1 - 2x Pr x Ca x Sr 0.8 Ba 1.2 Cu 3 O 7 - δ system. For the Gd 0.8 Pr 0.1 Ca 0.1 Sr 0.8 Ba 1.2 Cu 3 O 7 - δ sample, after heating in argon followed by oxygen annealing, the orthorhombicity increases accompanied by 10 K increase in Tc. These results show that though our data indicate an ion-size effect, the Tc suppression rate dTc/dx depends very much on the heat treatment adopted to prepare the samples.

HETEROSTRUCTURAL FLUCTUATIONS IN SUPERCONDUCTORS

1992 ◽  
Vol 06 (01) ◽  
pp. 91-107 ◽  
Author(s):  
V. I. YUKALOV
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
High Temperature Superconductors ◽  
Crystallographic Structure ◽  
Superconducting Properties

Superconductors are considered in which there occur fluctuations of one crystallographic structure inside another. The role of these heterostructural fluctuations on superconducting properties are analysed. The occurrence of these fluctuations explains anomalous saggings of Mössbauer factor at phase transition in high-temperature superconductors.

Superconducting Properties of Te-Substituted (Tl2-xTex) Ba2CaCu2O8-δ

2019 ◽  
Vol 290 ◽  
pp. 239-244 ◽  
Author(s):  
Syahrul Humaidi ◽  
Eddy Marlianto ◽  
S. Marhaposan ◽  
Roslan Abd-Shukor
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Normal State ◽  
Electrical Resistance ◽  
High Temperature Superconductors ◽  
Solid State Reaction Method ◽  
Precursor Powder ◽  
Superconducting Properties ◽  
State Behavior ◽  
Reaction Method

The Tl2-xTexBa2CaCu2O8-δ (Tl-2212) high temperature superconductors with x = 0.0-0.5 have been prepared by the standard solid-state reaction method. The precursor powder were sintered at 900°C for 24 h with several grindings and heating. The powder were then pressed into pellets and heated at 910°C in oxygen flow for 4 min followed by furnace cooling. The electrical resistance versus temperature dependence measurements showed metallic normal state behavior for all samples. Substitution of Te at the Tl-site led to multi-phasic samples. The x = 0.4 sample showed the highestTc zero= 98 K and Tconset= 111K. The Tl-2212 phase increased from 50% for x=0 up to 92% in the x= 0.4 sample.

scholarly journals Angle-resolved photoemission studies on iron based high temperature superconductors

2018 ◽  
Vol 67 (20) ◽  
pp. 207413
Author(s):  
Zhao Lin ◽  
Liu Guo-Dong ◽  
Zhou Xing-Jiang
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Iron Based
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