Unconventional superconducting states on doped Shastry-Sutherland lattice
Abstract
By using a renormalized mean-field theory, we investigate the phase diagram of $t$-$t'$-$J$-$J'$ model on two dimensional Shastry-Sutherland lattice which are topologically equivalent to synthesized material $\mathrm{SrCu_2(BO_3)_2}$. We find that the symmetry of superconductivity ground state depends on the frustration amplitude $\eta=t'/t$ and doping concentration. For weak to intermediate frustration, $d_{x^2-y^2}$-wave pairing symmetry is robust in a large parameter region. Around the symmetric point $|\eta|=1$, d-wave, $s$-s-wave pairing as well as staggered flux may serve as ground state by varying the doping level. There is a first-order transition between these distinct ground states. For larger frustration $|\eta|>1$, the ground state has an $s$-s-wave symmetry for both hole and electron doping.
- Publication:
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arXiv e-prints
- Pub Date:
- February 2009
- DOI:
- 10.48550/arXiv.0902.2508
- arXiv:
- arXiv:0902.2508
- Bibcode:
- 2009arXiv0902.2508H
- Keywords:
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- Condensed Matter - Superconductivity
- E-Print:
- 6 pages, 7 figures