Orbital Symmetry and Orbital Excitations in High-Tc Superconductors
1
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
2
Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. S. ojasiewicza 11, PL-30348 Kraków, Poland
3
Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Condens. Matter 2019, 4(2), 46; https://doi.org/10.3390/condmat4020046
Received: 12 March 2019
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Revised: 29 April 2019
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Accepted: 2 May 2019
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Published: 6 May 2019
(This article belongs to the Special Issue From cuprates to Room Temperature Superconductors)
We discuss a few possibilities of high- superconductivity with more than one orbital symmetry contributing to the pairing. First, we show that the high energies of orbital excitations in various cuprates suggest a simplified model with a single orbital of symmetry doped by holes. Next, several routes towards involving both orbital symmetries for doped holes are discussed: (i) some give superconductivity in a CuO monolayer on Bi2212 superconductors, Sr CuO , Ba CuO , while (ii) others as nickelate heterostructures or Eu Sr NiO , could in principle realize it as well. At low electron filling of Ru ions, spin-orbital entangled states of symmetry contribute in Sr RuO . Finally, electrons with both and orbital symmetries contribute to the superconducting properties and nematicity of Fe-based superconductors, pnictides or FeSe. Some of them provide examples of orbital-selective Cooper pairing.
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Keywords:
high-Tc superconductivity; orbital symmetry; orbital excitation; charge-transfer insulator; Fermi surface; spin-orbit coupling; spin-orbital entanglement; electron-phonon; Cooper pairing
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MDPI and ACS Style
Oleś, A.M.; Wohlfeld, K.; Khaliullin, G. Orbital Symmetry and Orbital Excitations in High-Tc Superconductors. Condens. Matter 2019, 4, 46. https://doi.org/10.3390/condmat4020046
AMA Style
Oleś AM, Wohlfeld K, Khaliullin G. Orbital Symmetry and Orbital Excitations in High-Tc Superconductors. Condensed Matter. 2019; 4(2):46. https://doi.org/10.3390/condmat4020046
Chicago/Turabian StyleOleś, Andrzej M., Krzysztof Wohlfeld, and Giniyat Khaliullin. 2019. "Orbital Symmetry and Orbital Excitations in High-Tc Superconductors" Condensed Matter 4, no. 2: 46. https://doi.org/10.3390/condmat4020046
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