Superconductivity on the density wave background with soliton-wall structure

Abstract

Superconductivity (SC) may microscopically coexist with density wave (DW) when the nesting of the Fermi surface (FS) is not perfect. There are, at least, two possible microscopic structures of a DW state with quasi-particle states remaining on the Fermi level and leading to the Cooper instability: (i) the soliton-wall phase and (ii) the small ungapped Fermi-surface pockets. The dispersion of such quasi-particle states strongly differs from that without DW, and so do the properties of SC on the DW background. The upper critical field $H_{c2}$ in such a SC state strongly increases as the system approaches the critical pressure, where superconductivity first appears. $H_{c2}$ may considerably exceed its typical value without DW and has unusual upward curvature as function of temperature. The results obtained explain the experimental observations in layered organic superconductors (TMTSF)${}_2$PF${}_6$ and $\alpha$-(BEDT TTF)${}_2$KHg(SCN)${}_4$.

7 pages

References in corpus (5)

• Pairing Symmetry Competition in Organic Superconductors
• Superconductivity in the charge-density-wave state of the organic metal α-(BEDT-TTF)2KHg(SCN)4
• Soliton phase near antiferromagnetic quantum critical point in Q1D conductors
• Properties of superconductivity on the density wave background with small ungapped Fermi surface pockets
• Nature of superconducting state in the new phase in (TMTSF)${}_2$PF${}_6$ under pressure

Cited by in corpus (8)

• Coexistence of Superconductor and Spin-Density Wave in (TMTSF)2ClO4: Spatial Structure of the Two-phase State
• Conductivity of anisotropic inhomogeneous superconductors above critical temperature
• Role of Anion Ordering in the Coexistence of Spin-Density-Wave and Superconductivity in (TMTSF)2ClO4
• Anisotropic zero-resistance onset in organic superconductors
• Evolution of shape and volume fraction of superconducting domains with temperature and anion disorder in (TMTSF)${}_2$ClO${}_4$
• On the size of superconducting islands on the density-wave background in organic metals
• First-order phase transition between superconductivity and charge/spin-density wave as the reason of their coexistence in organic metals
• Conductivity anisotropy helps to reveal the microscopic structure of a density wave at imperfect nesting