Generic nodeless Larkin-Ovchinnikov states due to singlet-triplet mixing in organic superconductors
Z. Zheng, D. F. Agterberg
DOI 10.1103/PhysRevB.82.024506 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Larkin-Ovchinnikov (LO) states typically have a singlet gap that vanishes along real-space lines. These real-space nodes lead to Andreev midgap states which can serve as a signature of LO pairing. We show that at these nodes, an odd-parity, spin-triplet component is always induced, leading to a nodeless LO phase. We find the two-dimensional weak coupling, clean limit s wave phase diagram when this spin-triplet part is included. The triplet component is large and increases the stability of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We also show that the spin-triplet contribution pushes the midgap states away from zero energy. Finally, we show how our results can be explained phenomenologically though Lifshitz invariants. These invariants provide a simple approach to understand the role of unconventional pairing states, spin-orbit coupling, and inhomogeneous mixed singlet-triplet states that are not due to an FFLO instability. We discuss our results in the context of organic superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Phase diagram and local tunneling spectroscopy of the Fulde-Ferrell-Larkin-Ovchinnikov states of a two-dimensional square-lattice d-wave superconductor
similarity 0.95Tao Zhou & C. S. Ting
Source status unknown — claims are unverified
Oscillations of magnetization and conductivity in anisotropic Fulde-Ferrell-Larkin-Ovchinnikov superconductors
similarity 0.95François Konschelle et al.
Source status unknown — claims are unverified
Strong Parity Mixing in the Fulde-Ferrell-Larkin-Ovchinnikov Superconductivity in Systems with Coexisting Spin and Charge Fluctuations
similarity 0.95Hirohito Aizawa et al.
Source status unknown — claims are unverified
Magnetic torque evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state in the layered organic superconductor κ−(BEDT−TTF)2Cu(NCS)2
similarity 0.94B. Bergk et al.
Source status unknown — claims are unverified
Superconductivity in an Organic Insulator at Very High Magnetic Fields
similarity 0.94L. Balicas et al.
Source status unknown — claims are unverified
Influence of internal disorder on the superconducting state in the organic layered superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br
similarity 0.94M. Pinterić et al.
Source status unknown — claims are unverified