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Anisotropic superconductivity emerging from the orbital degrees of freedom in a $$Gamma_3$$ non-Kramers doublet system

Kubo, Katsunori 

We study superconductivity in a three-orbital model for $$f^2$$ ions with the $$Gamma_3$$ crystalline electric field (CEF) ground state. An antiferromagnetic interaction between the $$Gamma_7$$ and $$Gamma_8$$ orbitals is introduced to stabilize the $$Gamma_3$$ CEF state. This interaction also works as an on-site attractive interaction for spin-singlet pairing between electrons in these orbitals. The interorbital pairing state composed of the $$Gamma_7$$ and $$Gamma_8$$ orbitals on the same site has the $$E_g$$ symmetry. Indeed, by applying the random phase approximation, we find that the $$E_g$$ spin-singlet superconducting state is realized over a wide parameter range.

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Category:Physics, Multidisciplinary

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