scholarly journals Broken relationship between superconducting pairing interaction and electronic dispersion kinks in La2−xSrxCuO4measured by angle-resolved photoemission

2013 ◽  
Vol 88 (22) ◽  
Author(s):  
S. R. Park ◽  
Y. Cao ◽  
Q. Wang ◽  
M. Fujita ◽  
K. Yamada ◽  
...  
Keyword(s):  
Pairing Interaction ◽  
Electronic Dispersion ◽  
Superconducting Pairing

scholarly journals Enhanced superconducting pairing interaction in indium-doped tin telluride

2009 ◽  
Vol 79 (2) ◽  
Author(s):  
A. S. Erickson ◽  
J.-H. Chu ◽  
M. F. Toney ◽  
T. H. Geballe ◽  
I. R. Fisher
Keyword(s):  
Pairing Interaction ◽  
Tin Telluride ◽  
Superconducting Pairing

Mirror Nesting and High TC Superconductivity

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3262-3265 ◽  
Author(s):  
V. I. Belyavsky ◽  
V. V. Kapaev ◽  
Yu. V. Kopaev
Keyword(s):  
Kinetic Energy ◽  
Relative Motion ◽  
Interaction Strength ◽  
Necessary Condition ◽  
Pairing Interaction ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Fermi Contour ◽  
Superconducting Pairing ◽  
Electron Dispersion

The necessary condition of superconducting pairing with large total pair momentum is mirror nesting that is a rise of pair Fermi contour due to matching of some pieces of the Fermi contour and an isoline of the pair-relative-motion kinetic energy. Such a condition may be satisfied, at definite total pair momenta, due to a special feature of electron dispersion. In the case of perfect mirror nesting a rise of the superconducting ordering turns out to be possible up to arbitrary small value of the pairing interaction strength.

scholarly journals Abrupt change of the superconducting gap structure at the nematic critical point in FeSe1−xSx

2018 ◽  
Vol 115 (6) ◽  
pp. 1227-1231 ◽  
Author(s):  
Yuki Sato ◽  
Shigeru Kasahara ◽  
Tomoya Taniguchi ◽  
Xiangzhuo Xing ◽  
Yuichi Kasahara ◽  
...  
Keyword(s):  
Critical Point ◽  
Abrupt Change ◽  
Rotational Symmetry ◽  
Magnetic Ordering ◽  
Superconducting Gap ◽  
Strong Impact ◽  
Pairing Interaction ◽  
Nematic Order ◽  
Superconducting Pairing ◽  
Gap Structure

The emergence of the nematic electronic state that breaks rotational symmetry is one of the most fascinating properties of the iron-based superconductors, and has relevance to cuprates as well. FeSe has a unique ground state in which superconductivity coexists with a nematic order without long-range magnetic ordering, providing a significant opportunity to investigate the role of nematicity in the superconducting pairing interaction. Here, to reveal how the superconducting gap evolves with nematicity, we measure the thermal conductivity and specific heat of FeSe1 − xSx, in which the nematicity is suppressed by isoelectronic sulfur substitution and a nematic critical point (NCP) appears at xc≈0.17. We find that, in the whole nematic regime (0≤x≤0.17), the field dependence of two quantities consistently shows two-gap behavior; one gap is small but highly anisotropic with deep minima or line nodes, and the other is larger and more isotropic. In stark contrast, in the tetragonal regime (x=0.20), the larger gap becomes strongly anisotropic, demonstrating an abrupt change in the superconducting gap structure at the NCP. Near the NCP, charge fluctuations of dxz and dyz orbitals are enhanced equally in the tetragonal side, whereas they develop differently in the orthorhombic side. Our observation therefore directly implies that the orbital-dependent nature of the nematic fluctuations has a strong impact on the superconducting gap structure and hence on the pairing interaction.

scholarly journals Interaction between Different Kinds of Quantum Phase Transitions

2021 ◽  
Vol 3 (2) ◽  
pp. 253-261
Author(s):  
Angel Ricardo Plastino ◽  
Gustavo Luis Ferri ◽  
Angelo Plastino
Keyword(s):  
Phase Transitions ◽  
Nuclear Physics ◽  
Body Problem ◽  
Quantum Phase Transitions ◽  
Quantum Phase ◽  
Exactly Solvable Models ◽  
Solvable Models ◽  
Many Body ◽  
Pairing Interaction ◽  
Exactly Solvable

We employ two different Lipkin-like, exactly solvable models so as to display features of the competition between different fermion–fermion quantum interactions (at finite temperatures). One of our two interactions mimics the pairing interaction responsible for superconductivity. The other interaction is a monopole one that resembles the so-called quadrupole one, much used in nuclear physics as a residual interaction. The pairing versus monopole effects here observed afford for some interesting insights into the intricacies of the quantum many body problem, in particular with regards to so-called quantum phase transitions (strictly, level crossings).

Sign in / Sign up

Export Citation Format

Share Document