Two-dimensional topological superconducting phases emerged from d-wave superconductors in proximity to antiferromagnets

Zhu, Guo-Yi; Wang, Ziqiang; Zhang, Guangming

doi:10.1209/0295-5075/118/37004

Cited by 12 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The other is a monolayer CuO 2 deposited on a single crystal of Bi 2 Sr 2 CaCu 2 O 8+δ (30). The monolayer CuO 2 is thought to be heavily overdoped due to charge transfer at the interface (31). Density functional theory gives a simulated hole density of p ∼ 0.9 and an apical oxygen distance d A = 2.11 Å with elongated octahedron (32).…”

mentioning

confidence: 99%

Superconductivity in a unique type of copper oxide

Zhao

Cao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

105

View full text Add to dashboard Cite

The mechanism of superconductivity in cuprates remains one of the big challenges of condensed matter physics. High-Tc cuprates crystallize into a layered perovskite structure featuring copper oxygen octahedral coordination. Due to the Jahn Teller effect in combination with the strong static Coulomb interaction, the octahedra in high-Tc cuprates are elongated along the c axis, leading to a 3dx2-y2 orbital at the top of the band structure wherein the doped holes reside. This scenario gives rise to 2D characteristics in high-Tc cuprates that favor d-wave pairing symmetry. Here, we report superconductivity in a cuprate Ba2CuO4-y, wherein the local octahedron is in a very exceptional compressed version. The Ba2CuO4-y compound was synthesized at high pressure at high temperatures and shows bulk superconductivity with critical temperature (Tc) above 70 K at ambient conditions. This superconducting transition temperature is more than 30 K higher than the Tc for the isostructural counterparts based on classical La2CuO4. X-ray absorption measurements indicate the heavily doped nature of the Ba2CuO4-y superconductor. In compressed octahedron, the 3d3z2-r2 orbital will be lifted above the 3dx2-y2 orbital, leading to significant 3D nature in addition to the conventional 3dx2-y2 orbital. This work sheds important light on advancing our comprehensive understanding of the superconducting mechanism of high Tc in cuprate materials.

show abstract

mentioning

confidence: 99%

Superconductivity in a unique type of copper oxide

Zhao

Cao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

105

View full text Add to dashboard Cite

show abstract

“…, with n l0 ≡ Ψ 0 |n ilσ |Ψ 0 , and α il is yet another variational parameter in addition to λ Γ|il introduced already in Eq. (7). By comparing Eqs.…”

Section: Appendix Amentioning

confidence: 99%

“…It has been argued that the pairing in CuO 2 /BSCCO results from the proximity effect, with the d-wave nodal lines avoided due to specific Fermi-surface topology in the monolayer or caused by magnetic ordering [4][5][6][7] . On the other hand, an intrinsic spin-orbital exchange induced pairing mechanism has been proposed, which leads to the nodeless superconducting state in a straightforward manner 8 .…”

Section: Introductionmentioning

confidence: 99%

Superconducting dome with $extended$ $s$-$wave$ pairing symmetry in the heavily hole-overdoped copper-oxide planes

Zegrodnik,

Wójcik,

Spałek

2021

Preprint

View full text Add to dashboard Cite

We analyze the two-orbital (with d x 2 −y 2 and d 3z 2 −r 2 orbitals) analogue of the t-J-U model as applied to the description of the copper-oxide monolayer deposited on the Bi2Sr2CaCu2O 8+δ substrate (CuO2/BSCCO). We show, that an extended s-wave superconducting dome appears in the heavily hole overdoped regime of the model, with dominant contribution to the pairing coming from the d 3z 2 −r 2 orbitals. Also, the lower critical doping for the appearance of the SC state concurs with the Lifshitz Transition after which the hole-like Fermi pockets are created around the M points in the Brillouin zone. The obtained results are in accord with the recent experimental result [cf. Y. Zhong et al., Sci. Bull. 61, 1239]. An analogous two-band description is also analyzed in the context of the Ba2CuO4−y bulk compound, where the heavily hole-overdoped situation is believed to be reached [cf. W. M. Li et al. PNAS 116, 12156 (2019)]. As we show, a two dome structure can be realized in such system with the d-and s-wave symmetries of the gap corresponding to the low hole-doping and heavily hole overdoped cases, respectively.

show abstract

“…In another context, the d-wave pairing was shown by MFT to be stable, and the quasiparticle excitation becomes nodeless, on a strong Neel background. 42,43 It is natural that the energetic ordering of the states in different symmetries depends on the starting model, and on the method by which the strong correlation effects are addressed.…”

Section: Finite Dopingmentioning

confidence: 99%

Superconductivity, Pair Density Wave, and Néel Order in Cuprates*

Chen¹,

Wang²,

Zhou³

et al. 2020

Chinese Phys. Lett.

View full text Add to dashboard Cite

We investigate in underdoped cuprates possible coexistence of the superconducting order at zero momentum and pair density wave (PDW) at momentum Q = (π, π) in the presence of a Neel order. By symmetry, the d-wave uniform singlet pairing dS0 can coexist with the d-wave triplet PDW dTQ, and the p-wave singlet PDW pSQ can coexist with the p-wave uniform triplet pT0. At half filling, we find the novel pSQ + pT0 state is energetically more favorable than the dS0 + dTQ state. At finite doping, however, the dS0 + dTQ state is more favorable. In both types of states, the variational triplet parameters, dTQ and pT0, are of secondary significance. Our results point to a fully symmetric Z2 quantum spin liquid with spinon Fermi surface in proximity to the Neel order at zero doping, and to intertwined d-wave triplet PDW fluctuations and spin moment fluctuations along with the dominant d-wave singlet superconductivity at finite doping. The results are obtained by variational quantum Monte Carlo simulations.

show abstract

Two-dimensional topological superconducting phases emerged from d-wave superconductors in proximity to antiferromagnets

Cited by 12 publications

References 28 publications

Superconductivity in a unique type of copper oxide

Superconductivity in a unique type of copper oxide

Superconducting dome with $extended$ $s$-$wave$ pairing symmetry in the heavily hole-overdoped copper-oxide planes

Superconductivity, Pair Density Wave, and Néel Order in Cuprates*

Contact Info

Product

Resources

About