scholarly journals Interface-enhanced electron-phonon coupling and high-temperature superconductivity in potassium-coated ultrathin FeSe films onSrTiO3

2016 ◽  
Vol 93 (2) ◽  
Author(s):  
Chenjia Tang ◽  
Chong Liu ◽  
Guanyu Zhou ◽  
Fangsen Li ◽  
Hao Ding ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Reply to the ‘Comment on “High-temperature superconductivity in transition metallic hydrides MH11 (M = Mo, W, Nb, and Ta) under high pressure”’ by X. Zheng and J. Zheng, Phys. Chem. Chem. Phys., 2022, 24, DOI: 10.1039/D1CP01474A

2022 ◽  
Author(s):  
Mingyang Du ◽  
Zihan Zhang ◽  
Hao Song ◽  
Hongyu Yu ◽  
Tian Cui ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Metal Hydride ◽  
High Temperature Superconductivity ◽  
Chem Phys ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Phys Chem Chem Phys

For the metal hydride MoH11, more than 60% of the electron–phonon coupling (λ) is contributed by hydrogen which leads to a diminishing role of the umklapp phonons.

scholarly journals Giant Electron-Phonon Anomaly in DopedLa2CuO4and Other Cuprates

2010 ◽  
Vol 2010 ◽  
pp. 1-24 ◽  
Author(s):  
D. Reznik
Keyword(s):  
High Temperature ◽  
High Temperature Superconductivity ◽  
Anomalous Behavior ◽  
Phonon Coupling ◽  
Subsequent Work ◽  
Electron Phonon Coupling ◽  
Bond Stretching ◽  
Mechanism Of Superconductivity ◽  
Phonon Anomaly ◽  
Made In

Since conventional superconductivity is mediated by phonons, their role in the mechanism of high temperature superconductivity has been considered very early after the discovery of the cuprates. The initial consensus was that phonons could not produce transition temperatures near 100 K, and the main direction of research focused on nonphononic mechanisms. Subsequent work last reviewed by L. Pintschovius in 2005 showed that electron-phonon coupling in the cuprates is surprisingly strong for some phonons and its role is controversial. Experiments performed since then identified anomalous behavior of certain Cu–O bond-stretching phonons in cuprates as an important phenomenon that is somehow related to the mechanism of superconductivity. A particularly big advance was made in the study of dopedLa2CuO4. This work is reviewed here.

scholarly journals Electrons and Phonons in High Temperature Superconductors

2013 ◽  
Vol 2013 ◽  
pp. 1-4
Author(s):  
Anu Singh ◽  
Hempal Singh ◽  
Vinod Ashokan ◽  
B. D. Indu
Keyword(s):  
Heat Capacity ◽  
High Temperature ◽  
Heat Transport ◽  
Function Theory ◽  
High Temperature Superconductors ◽  
Phonon Coupling ◽  
Electronic Heat Capacity ◽  
Electron Phonon Coupling ◽  
Electronic Heat ◽  
Double Time

The defect-induced anharmonic phonon-electron problem in high-temperature superconductors has been investigated with the help of double time thermodynamic electron and phonon Green’s function theory using a comprehensive Hamiltonian which includes the contribution due to unperturbed electrons and phonons, anharmonic phonons, impurities, and interactions of electrons and phonons. This formulation enables one to resolve the problem of electronic heat transport and equilibrium phenomenon in high-temperature superconductors in an amicable way. The problem of electronic heat capacity and electron-phonon problem has been taken up with special reference to the anharmonicity, defect concentration electron-phonon coupling, and temperature dependence.

scholarly journals High temperature superconductivity at FeSe/LaFeO3 interface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yuanhe Song ◽  
Zheng Chen ◽  
Qinghua Zhang ◽  
Haichao Xu ◽  
Xia Lou ◽  
...  
Keyword(s):  
High Temperature Superconductivity ◽  
Theoretical Calculations ◽  
Single Layer ◽  
General Mechanism ◽  
Phonon Coupling ◽  
Unique Case ◽  
Interfacial Engineering ◽  
Electron Phonon Coupling ◽  
Superconducting Pairing ◽  
Interfacial Charge

AbstractEnormous enhancement of superconducting pairing temperature (Tg) to 65 K in FeSe/SrTiO3 has made it a spotlight. Despite the effort of interfacial engineering, FeSe interfaced with TiOx remains the unique case in hosting high Tg, hindering a decisive understanding on the general mechanism and ways to further improving Tg. Here we constructed a new high-Tg interface, single-layer FeSe interfaced with FeOx-terminated LaFeO3. Large superconducting gap and diamagnetic response evidence that the superconducting pairing can emerge near 80 K, highest amongst all-known interfacial superconductors. Combining various techniques, we reveal interfacial charge transfer and strong interfacial electron-phonon coupling (EPC) in FeSe/LaFeO3, showing that the cooperative pairing mechanism works beyond FeSe-TiOx. Intriguingly, the stronger interfacial EPC than that in FeSe/SrTiO3 is likely induced by the stronger interfacial bonding in FeSe/LaFeO3, and can explain the higher Tg according to recent theoretical calculations, pointing out a workable route in designing new interfaces to achieve higher Tg.

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