Superconducting Bardeen-Cooper-Schrieffer versus Fulde-Ferrell-Larkin-Ovchinnikov states of heavy quasiparticles with spin-dependent masses and Kondo-type pairing
M. M. Maśka, M. Mierzejewski, J. Kaczmarczyk, J. Spałek
DOI 10.1103/PhysRevB.82.054509 · Physical Review B
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Abstract
The observation of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconducting state and detection of the spin-dependent effective masses (SDM) of quasiparticles in heavy-fermion systems are combined into a single theoretical framework within the (mean-field) Gutzwiller approximation for the correlated states of electrons on a two-dimensional square lattice. The tight-binding approximation with nonzero first two hopping integrals is assumed for the bare electrons. The appearance of the spin-split masses extends essentially the regime of temperatures and applied magnetic fields in which FFLO (of the homogeneous, Fulde-Ferrell form) is stable and thus is claimed to be very important for its detectability. The analysis is performed within the Kondo-lattice limit of the finite-U Anderson–lattice model accounting in a coherent manner for both the mass renormalization (in the Gutzwiller approximation) and real-space pairing among the correlated heavy quasiparticles, the latter driven by the Kondo-type exchange interaction. The results are compared briefly with those obtained recently for a simpler situation of interacting fermion gas treated within a similar scheme. In Appendices A and B the Kondo real-space pairing and the Bogolyubov transformation for the SDM case are detailed.
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| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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