Cooper pairs in a two-orbital superconductor: bands filling effect on pair sizes

23rd International Symposium on the Jahn-Teller Effect

Litak, Grzegorz^1,2 ; Örd, Teet^3 ; Rägo, Küllike^3 ; Vargunin, Artjom^3,4

Lublin University of Technology, Faculty of Mechanical Engineering, Nadbystrzycka 36, Lublin

PL-20618, Poland^1

AGH University of Science and Technology, Department of Process Control, Mickiewicza 30, Krakow

PL-30-059, Poland^2

Institute of Physics, University of Tartu, W. Ostwaldi Str. 1, Tartu

50411, Estonia^3

Department of Theoretical Physics, The Royal Institute of Technology, Stockholm

SE-10691, Sweden^4

关键词: Cooper pair;    Filling effects;    Hubbard correlation;    Interband;    Negative-U;    Proximity effects;    Superconducting state;    Temperature dependencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/833/1/012017/pdf
DOI  :  10.1088/1742-6596/833/1/012017

来源: IOP

【 摘 要 】

The two-orbital superconducting state is modeled by on-site intra-orbital negative-U Hubbard correlations together with inter-orbital pair-transfer interactions. The influence of bands filling on the temperature dependencies of the sizes of Cooper pairs in different orbitals is analyzed. It is found that the sizes exhibit unconventionally strong variation in the temperature scale for occupations favouring interband proximity effect.