Unconventional Superconducting Symmetry in a Checkerboard Antiferromagnet

Abstract

We use a renormalized mean field theory to study the Gutzwiller projected BCS states of the extended Hubbard model in the large $U$ limit, or the $t$-$t^{\prime }$-$J$-$J^{\prime }$ model on a two-dimensional checkerboard lattice. At small $t^{\prime }/t$, the frustration due to the diagonal terms of $t^{\prime }$ and $J^{\prime }$ does not alter the $d_{x^2-y^2}$-wave pairing symmetry, and the negative (positive) $t^{\prime }/t$ enhances (suppresses) the pairing order parameter. At large $t^{\prime }/t$, the ground state has an extended s-wave symmetry. At the intermediate $t^{\prime }/t$, the ground state is $d+id$ or $d+is$-wave with time reversal symmetry broken.

6 pages, 6 figures

References in corpus (9)

• Pyrochlore Photons: The U(1) Spin Liquid in a S=1/2 Three-Dimensional Frustrated Magnet
• U(1) Gauge Theory of the Hubbard Model : Spin Liquid States and Possible Application to k-(BEDT-TTF)_2 Cu_2 (CN)_3
• Anisotropic pyrochlores and the global phase diagram of the checkerboard antiferromagnet
• Bond order from disorder in the planar pyrochlore magnet
• Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
• Spin-Charge Separation in Two-dimensional Frustrated Quantum Magnets
• Spinon deconfinement in doped frustrated quantum antiferromagnets
• Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets
• Enhanced pairing in doped quantum magnets with frustrating hole motion

Cited by in corpus (3)

• s-wave Superconductivity Phase Diagram in the Inhomogeneous Two-Dimensional Attractive Hubbard Model
• Systematic Analysis of Frustration Effects in Anisotropic Checkerboard Lattice Hubbard Model
• Supersolid phases of a doped valence-bond quantum antiferromagnet: Evidence for a coexisting superconducting order parameter