Possible electronic properties in high-Tc superconducting cuprates from cluster calculations

1996 ◽  
Vol 259 (3-4) ◽  
pp. 241-246 ◽  
Author(s):  
Itai Panas ◽  
Refael Gatt
Keyword(s):  
Electronic Properties ◽  
High Tc ◽  
Superconducting Cuprates ◽  
Cluster Calculations

Modifying electronic properties of interfaces in high-Tc superconductors by doping

1999 ◽  
Vol 326-327 ◽  
pp. 7-11 ◽  
Author(s):  
H. Hilgenkamp ◽  
C.W. Schneider ◽  
R.R. Schulz ◽  
B. Goetz ◽  
A. Schmehl ◽  
...  
Keyword(s):  
Electronic Properties ◽  
High Tc Superconductors ◽  
High Tc

scholarly journals High-Tc Superconducting Cuprates, (Ce,Y)sO2s-2Sr2(Cu2.75Mo0.25)O6+δ: Tc-increase with apical Cu-O decrease at constant Cu-O planar distance

2014 ◽  
Vol 507 (1) ◽  
pp. 012031 ◽  
Author(s):  
M Marezio ◽  
O Chmaissem ◽  
C Bougerol ◽  
M Karppinen ◽  
H Yamauchi ◽  
...  
Keyword(s):  
High Tc ◽  
Superconducting Cuprates

A STRUCTURAL CHEMICAL MODEL FOR HIGH Tc CERAMIC SUPERCONDUCTORS

1987 ◽  
Vol 01 (07n08) ◽  
pp. 275-288 ◽  
Author(s):  
S.R. OVSHINSKY ◽  
S.J. HUDGENS ◽  
R.L. LINTVEDT ◽  
D.B. RORABACHER
Keyword(s):  
Electronic Properties ◽  
Oxygen Vacancies ◽  
Oxygen Removal ◽  
Bose Condensation ◽  
Oxidation States ◽  
Chemical Model ◽  
Electrically Conductive ◽  
High Tc ◽  
Ceramic Superconductors ◽  
Mixed Oxidation

A structual chemical model for high Tc ceramic superconductors is proposed in which carriers pairs, coupled through a superexchange process, undergo Bose condensation. In the Y-Ba-Cu-O system, Cu atoms on “chain” sites and “sheet” sites are initially assigned formal oxidation states of +3 and +2, respectively, and “sheet”/“chain” interactions are then introduced to bring about the electrically conductive mixed oxidation state. This model explains the presence of labile oxygen in the “chain” structures, describes the structure of deoxygenated phases exhibiting ordered oxygen vacancies in the “chains”, and allows interpretation of the effects of oxygen removal on magnetic and electronic properties of the material.

scholarly journals Dynamical charge density fluctuations pervading the phase diagram of a Cu-based high-Tc superconductor

Science ◽  
2019 ◽  
Vol 365 (6456) ◽  
pp. 906-910 ◽  
Author(s):  
R. Arpaia ◽  
S. Caprara ◽  
R. Fumagalli ◽  
G. De Vecchi ◽  
Y. Y. Peng ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Charge Density ◽  
Charge Density Waves ◽  
Density Fluctuations ◽  
Large Area ◽  
High Tc ◽  
Superconducting Cuprates ◽  
X Ray Scattering ◽  
Underdoped Region ◽  
Dynamical Charge

Charge density modulations have been observed in all families of high–critical temperature (Tc) superconducting cuprates. Although they are consistently found in the underdoped region of the phase diagram and at relatively low temperatures, it is still unclear to what extent they influence the unusual properties of these systems. Using resonant x-ray scattering, we carefully determined the temperature dependence of charge density modulations in YBa2Cu3O7–δ and Nd1+xBa2–xCu3O7–δ for several doping levels. We isolated short-range dynamical charge density fluctuations in addition to the previously known quasi-critical charge density waves. They persist up to well above the pseudogap temperature T*, are characterized by energies of a few milli–electron volts, and pervade a large area of the phase diagram.

Electronic Properties of some Ternary and Quaternary Oxides of the VIII B and I B Transition Elements: Application to High Tc Superconductivity

1989 ◽  
Vol 156 ◽  
Author(s):  
M. Pouchard ◽  
J-C. Grenier ◽  
J-P. Doumerc ◽  
G. Demazeau ◽  
J-P. Chaminade ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Structural Parameters ◽  
Mixed Valence ◽  
Oxidation States ◽  
Transition Elements ◽  
High Tc Superconductors ◽  
High Tc ◽  
Electronic Configurations ◽  
Spin Electronic ◽  
Mixed Valence Compounds

ABSTRACTIn the scope of the Goodenough model, a brief review of the electronic properties of some 3d transition elements (M = Fe, Co, Ni and Cu ) is given; the main relevant electronic and structural parameters are emphasized. Then a special attention is focussed on N/(N−1) and N/(N−2) electron mixed valence compounds.Finally some particular features of copper are discussed and their relevance to high Tc superconductors is pointed out:-the srong covalency of Cu-O bondings involving a possible delocalization of the hole between trivalent copper and oxygen,-the existence of low and high spin electronic configurations for CuIII,-the disproportionation of Cu2+ and its role in the formation of hole pairs,Cu-O distances very close for the three successive oxidation states of copper favouring the disproportionation process.

43Ca NMR Study of Bismuth-Based High-Tc Superconductors

1994 ◽  
Vol 49 (1-2) ◽  
pp. 373-378 ◽  
Author(s):  
A. Trokiner ◽  
L. Le Noc ◽  
A. Yakubovskii ◽  
K.N. Mykhalyov ◽  
S.V. Verkhovskii
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Electronic Properties ◽  
High Tc Superconductors ◽  
High Tc ◽  
Structural Assignment ◽  
Bismuth Compounds ◽  
Nmr Study

Abstract As a first step of a study of the electronic properties of CuO2 planes by probing calcium nuclei in the bismuth-based high-Tc materials we report here the structural assignment of Ca NMR lines measured in 43Ca-enriched samples of n = 2 ((Bi,Pb)2Sr2CaCu2O8+x) and n = 3 ((Bi,Pb)2Sr2-Ca2Cu3O10+x) bismuth compounds. Powdered samples were investigated as well as oriented pow­ ders, achieved by uniaxial alignment of the grains in a 7T magnetic field. For the main calcium site (Ca between two CuO2 planes), we could determine the quadrupolar as well as the shift tensors. The results indicate that, in the same way as yttrium nuclei in YBaCuO, calcium nuclei are sensitive to the magnetic susceptibility of the metallic CuO2 planes.

Sign in / Sign up

Export Citation Format

Share Document