首页|Effects of carrier density and interactions on pairing symmetry in a t2g model

Effects of carrier density and interactions on pairing symmetry in a t2g model

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By utilizing the fluctuation exchange approximation method,we perform a study on the superconducting pairing symmetry in a t2g three-orbital model on the square lattice.Although the tight-binding parameters of the model are based on Sr2RuO4,we have systematically studied the evolution of superconducting pairing symmetry with the carrier density and interactions,making our findings relevant to a broader range of material systems.Under a moderate Hund's coupling,we find that spin fluctuations dominate the superconducting pairing,leading to a prevalent spin-singlet pairing with a dx2-y2-wave symmetry for the carrier density within the range of n=1.5-4 per site.By reducing the Hund's coupling,the charge fluctuations are enhanced and play a crucial role in determining the pairing symmetry,leading to a transition of the pairing symmetry from the spin-singlet dx2-y2-wave to the spin-triplet p-wave.Furthermore,we find that the superconducting pairings are orbital dependent.As the carrier density changes from n=4 to n=1.5,the active orbitals for superconducting pairing shift from the quasi-two-dimensional orbital dxy to the quasi-one-dimensional orbitals dxz and dyz.

unconventional superconductivitypairing mechanismFermi surfacethree-orbital model

李云霄、西文翰、董召阳、姚子健、于顺利、李建新

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National Laboratory of Solid State Microstructures and Department of Physics,Nanjing University,Nanjing 210093,China

Nanjing University of Science and Technology,Nanjing 210094,China

Department of Physics,Nanjing Normal University,Nanjing 210023,China

Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2021YFA1400400921652051207417512374137

2024

10.1088/1674-1056/ad1094

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(1)
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