Spin dynamics of high-Tc cuprates in the metallic state as a result of dual itinerant-localized nature of magnetism in strongly correlated CuO2 plane (YBa2Cu3O6+x)

1995 ◽  
Vol 215 (1) ◽  
pp. 41-61 ◽  
Author(s):  
F. Onufrieva
Keyword(s):  
Spin Dynamics ◽  
Cuo2 Plane ◽  
Metallic State ◽  
Strongly Correlated ◽  
High Tc ◽  
High Tc Cuprates

scholarly journals Are Superconductivity Mechanisms a Matter for Chemists?

2020 ◽  
Vol 5 (4) ◽  
pp. 67
Author(s):  
Michel Pouchard ◽  
Antoine Villesuzanne
Keyword(s):  
Fermi Level ◽  
Phonon Mode ◽  
Tight Binding ◽  
Superconducting Gap ◽  
Metallic State ◽  
Edge States ◽  
High Tc ◽  
Iron Selenide ◽  
Double Well Potential ◽  
High Tc Cuprates

From a tight-binding approach to the instability of nonbonding electronic states, along a double-well potential, we consider here how the coupling of these states with a phonon mode can open a superconducting gap at the Fermi level. The alternation of broken- and unbroken-symmetry states, along the phonon breathing distortion, induces the mixing of band-edge states on a very short timescale, according to the noncrossing rule of chemists. We show that this mixing may generate cationic and anionic disproportionation. The negative U mechanism is thus justified here, leading to the mixing of occupied and unoccupied pair states, for the opening of a 2Δ superconducting gap. The closeness of broad σ* and narrow π* bands in the vicinity of the Fermi level should favor the superconducting phase over the insulating or metallic state, in agreement with Micnas et al.’s studies. We applied this approach to several families of superconducting materials, i.e., doped strontium titanate, high-TC cuprates and iron selenide.

Buckling of the CuO2 Plane in Single Crystals of La-Based High-TC Cuprates Observed by NMR

2006 ◽  
Author(s):  
Takayuki Goto ◽  
Masanori Ueda ◽  
Hidemitsu Sumikawa ◽  
Takao Suzuki ◽  
Masaki Fujita ◽  
...  
Keyword(s):  
Single Crystals ◽  
Cuo2 Plane ◽  
High Tc ◽  
High Tc Cuprates

Spin dynamics in high- Tc cuprates

1995 ◽  
Vol 213-214 ◽  
pp. 6-10 ◽  
Author(s):  
H. Fukuyama ◽  
H. Kohno ◽  
B. Normand ◽  
T. Tanamoto
Keyword(s):  
Spin Dynamics ◽  
High Tc ◽  
High Tc Cuprates

On the CuO2 plane gap anisotropy of high-Tc cuprates and the high-Tc mechanism

1996 ◽  
Vol 210 (4-5) ◽  
pp. 337-340 ◽  
Author(s):  
Fui-sui Liu ◽  
Zhong-cheng Wang ◽  
Xiao-jian Yuan ◽  
Wan-fang Chen
Keyword(s):  
Cuo2 Plane ◽  
High Tc ◽  
Gap Anisotropy ◽  
High Tc Cuprates

Spin dynamics in the metallic state of the high-Tc superconducting system YBa2Cu3O6 + x

1995 ◽  
Vol 215 (1) ◽  
pp. 30-40 ◽  
Author(s):  
P. Bourges ◽  
L.P. Regnault ◽  
J.Y. Henry ◽  
C. Vettier ◽  
Y. Sidis ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Metallic State ◽  
High Tc
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