Orbital Symmetry and Orbital Excitations in High-Tc Superconductors

We discuss a few possibilities of high- T c 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 x 2 − y 2 symmetry doped by holes. Next,...

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Bibliographic Details
Published in:Condensed matter 2019-06, Vol.4 (2), p.46
Main Authors: Oleś, Andrzej M., Wohlfeld, Krzysztof, Khaliullin, Giniyat
Format: Article
Language:English
Subjects:
Bismuth strontium calcium copper oxide
charge-transfer insulator
Cooper pairing
Copper
Cuprates
Electron spin
electron-phonon
Entangled states
Excitation
Fermi surface
Group 5A compounds
Heterostructures
high-Tc superconductivity
orbital excitation
orbital symmetry
spin-orbit coupling
spin-orbital entanglement
Strontium
Superconductivity
Superconductors
Symmetry
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Summary:We discuss a few possibilities of high- T c 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 x 2 − y 2 symmetry doped by holes. Next, several routes towards involving both e g orbital symmetries for doped holes are discussed: (i) some give superconductivity in a CuO 2 monolayer on Bi2212 superconductors, Sr 2 CuO 4 − δ , Ba 2 CuO 4 − δ , while (ii) others as nickelate heterostructures or Eu 2 − x Sr x NiO 4 , could in principle realize it as well. At low electron filling of Ru ions, spin-orbital entangled states of t 2 g symmetry contribute in Sr 2 RuO 4 . Finally, electrons with both t 2 g and e g 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.
ISSN:2410-3896
2410-3896
DOI:10.3390/condmat4020046