Pressure dependence of the superconducting transition temperature ofHgBa2CaCu2O6+δas a function of carrier concentration

1997 ◽  
Vol 56 (10) ◽  
pp. 6302-6307 ◽  
Author(s):  
Xiaojia Chen ◽  
Zhengkuan Jiao
Keyword(s):  
Transition Temperature ◽  
Carrier Concentration ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition

scholarly journals Pressure dependence of superconducting-transition temperature of YbGa1.1Si0.9

2010 ◽  
Vol 215 ◽  
pp. 012035 ◽  
Author(s):  
A Ohmura ◽  
K Fujimaki ◽  
M Einaga ◽  
F Ishikawa ◽  
A Nakayama ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition

scholarly journals Unconventional Co-Existence of Insulating Nano-Regions and Conducting Filaments in Reduced SrTiO3: Mode Softening, Local Piezoelectricity, and Metallicity

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 437
Author(s):  
Annette Bussmann-Holder ◽  
Hugo Keller ◽  
Arndt Simon ◽  
Gustav Bihlmayer ◽  
Krystian Roleder ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Carrier Concentration ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
First Principles Calculations ◽  
Effective Electron ◽  
Mode Softening ◽  
Component Type ◽  
Electron Phonon Coupling ◽  
Transverse Optic

Doped SrTiO3 becomes a metal at extremely low doping concentrations n and is even superconducting at n < 1020 cm−3, with the superconducting transition temperature adopting a dome-like shape with increasing carrier concentration. In this paper it is shown within the polarizability model and from first principles calculations that up to a well-defined carrier concentration nc transverse optic mode softening takes place together with polar nano-domain formation, which provides evidence of inhomogeneity and a two-component type behavior with metallicity coexisting with polarity. Beyond this region, a conventional metal is formed where superconductivity as well as mode softening is absent. For n ≤ nc the effective electron-phonon coupling follows the superconducting transition temperature. Effusion measurements, as well as macroscopic and nanoscopic conductivity measurements, indicate that the distribution of oxygen vacancies is local and inhomogeneous, from which it is concluded that metallicity stems from filaments which are embedded in a polar matrix as long as n ≤ nc.

scholarly journals Pressure dependence of the superconducting transition temperatures in La1.85Sr0.15CuO4 to 8 GPa

1987 ◽  
Vol 2 (6) ◽  
pp. 783-785 ◽  
Author(s):  
D. Erskine ◽  
E. Hess ◽  
P. Y. Yu ◽  
A. M. Stacy
Keyword(s):  
Transition Temperature ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Diamond Anvil Cell ◽  
Experimental Results ◽  
Transition Temperatures ◽  
Superconducting Transition ◽  
Diamond Anvil ◽  
Phonon Model

Pressure dependence of the superconducting transition temperature in La1.85Sr0.15CuO4 has been measured to 8 GPa using a diamond anvil cell. The experimental results are discussed within the conventional electron-phonon model of superconductivity.

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