Nearly degenerate px+ipy and dx2−y2 pairing symmetry in the heavy fermion superconductor YbRh2Si2
Yu Li, Qianqian Wang, Yuanji Xu, Wenhui Xie, Yi-feng Yang
DOI 10.1103/PhysRevB.100.085132 · Physical Review B
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Abstract
Recent discovery of superconductivity in YbRh2Si2 has raised particular interest in its pairing mechanism and gap symmetry. Here we propose a phenomenological theory of its superconductivity and investigate possible gap structures by solving the multiband Eliashberg equations combining realistic Fermi surfaces from first-principles calculations and a quantum critical form of magnetic pairing interactions. The resulting gap symmetry shows sensitive dependence on the in-plane propagation wave vector of the quantum critical fluctuations, suggesting that superconductivity in YbRh2Si2 is located on the border of (px+ipy) and dx2−y2-wave solutions. This leads to two candidate phase diagrams: one has only a spin-triplet (px+ipy)-wave superconducting phase; the other contains multiple phases with a spin-singlet dx2−y2-wave state at zero field and a field-induced spin-triplet (px+ipy)-wave state. In addition, the electron pairing is found to be dominated by the “jungle-gym” Fermi surface rather than the “doughnut”-like one, in contrast to previous thought. This requests a more elaborate and renewed understanding of the electronic properties of YbRh2Si2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YbRh2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.002 | Pressure not reported | unknown |
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