scholarly journals The Role of Polarons in Cuprates Hi-Tc Superconductivity

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
M. I. Umo
Keyword(s):  
High Temperature ◽  
Critical Temperature ◽  
Kinetic Equation ◽  
High Temperature Superconductivity ◽  
Boltzmann Kinetic Equation ◽  
Apical Oxygen ◽  
Phonon Contribution ◽  
Extension Model ◽  
Jahn Teller

The phonon contribution to the phenomenon of high temperature superconductivity in the cuprates is argued as being masked as polarons generated by the polarization of the charge reservoir accompanying the Jahn-Teller tilting of the apical oxygen. We discuss the Mahan oscillator-spring extension model as an analogy to the charge reservoir-CuO plane c-axis polarons. Using the Boltzmann kinetic equation, we show that the polaron dissociates or collapses at a temperature corresponding to the critical temperature of the superconductor.

ROLE OF THE ELECTRON–PHONON INTERACTION ON THE SPECTRAL DENSITY AND PSEUDOGAP IN CUPRATES

2002 ◽  
Vol 16 (23) ◽  
pp. 3465-3471
Author(s):  
I. CHAUDHURI ◽  
S. K. GHATAK
Keyword(s):  
Critical Temperature ◽  
Spectral Density ◽  
Low Energy ◽  
Phonon Interaction ◽  
Energy Excitation ◽  
Electron Phonon Interaction ◽  
Peak Structure ◽  
Electronic Model ◽  
Jahn Teller

The pseudogap structure in low energy excitation in cuprates appears below a temperature and the spectral density exhibits strong wave-vector dependence. An electronic model that emphasized the coupling of carrier in Cu-O with phonon is examined for pseudogap. The electron–phonon interaction originates from the modulation of on-site and hopping energy and leads to spontaneous Jahn–Teller-like distortion and pseudogap below a critical temperature. At low temperature the spectral density has two-peak structure about the Fermi level for all k along Γ-M whereas such structure exists along Γ-X for small k only. The magnitude of pseudogap shows strong k-dependence — maximum along Γ-M and vanishes along Γ-X. These features emphasize the role of electron–phonon interaction in formation of pseudogap.

Role of structural instability in high-temperature superconductivity and its effect on isotope effect

1992 ◽  
Vol 128 (1) ◽  
pp. 105-110 ◽  
Author(s):  
A. Bussmann-Holder ◽  
A. R. Bishop ◽  
A. Migliori ◽  
Z. Fisk
Keyword(s):  
High Temperature ◽  
Isotope Effect ◽  
High Temperature Superconductivity ◽  
Structural Instability

New surprises “down below”: Recent successes in the synthesis of actinide materials

MRS Bulletin ◽  
2010 ◽  
Vol 35 (11) ◽  
pp. 877-882 ◽  
Author(s):  
J. L. Sarrao ◽  
Y. Haga ◽  
R. C. C. Ward
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Periodic Table ◽  
High Temperature Superconductivity ◽  
Electronic States ◽  
High Quality

Recent discoveries of novel electronic states, including relatively high-temperature superconductivity, in the actinides point to exciting prospects for future discoveries at the bottom of the periodic table. A key ingredient in all of the successes discussed here is the role of high-quality synthesis in enabling advances. Results on PuCoGa51, NpPd5Al2, and single crystal uranium are discussed.

scholarly journals Role of Antiferromagnetic Fluctuations in High Temperature Superconductivity

10.5772/37813 ◽  
2012 ◽  
Author(s):  
Sung-Ho Suck ◽  
Jae-Hyeon Eom ◽  
Seung Joon ◽  
Jae-Gon Eom ◽  
Sung-Sik Lee
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity

Structural phase transition in YBa2Cu3O7−δ: the role of dimensionality for high temperature superconductivity

1987 ◽  
Vol 63 (5) ◽  
pp. 385-388 ◽  
Author(s):  
Ivan K. Schuller ◽  
D.G. Hinks ◽  
M.A. Beno ◽  
D.W. Capone ◽  
L. Soderholm ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Structural Phase Transition ◽  
High Temperature Superconductivity ◽  
Structural Phase

Role of phonons in the mechanism of high-temperature superconductivity

2004 ◽  
Vol 408-410 ◽  
pp. 292-295 ◽  
Author(s):  
T. Egami ◽  
P. Piekarz ◽  
J.-H. Chung
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity
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