Spiral magnetism and chiral superconductivity in a Kondo-Hubbard triangular lattice model
Bibliographic record
Abstract
Building on the results of [Faye et al., Phys. Rev. B 97, 235151 (2018)], which identified an antiferromagnetic (AFM) and Kondo singlet phases on the Kondo-Hubbard square lattice, we use the variational cluster approximation to investigate the competition between these phases on a two-dimensional triangular lattice with ${120}^{o}$ spin orientation. In addition to the AFM exchange interaction ${J}_{\ensuremath{\perp}}$ between the localized (impurity) and conduction (itinerant) electrons, our model includes the local repulsion $U$ of the conduction electrons and the Heisenberg interaction ${J}_{H}$ between the impurities. At half filling, we obtain the quantum phase diagrams in both planes $({J}_{\ensuremath{\perp}},U{J}_{\ensuremath{\perp}})$ and $({J}_{\ensuremath{\perp}},{J}_{H})$. We identify a long-range, three-sublattice, spiral magnetic order which dominates the phase diagrams for small ${J}_{\ensuremath{\perp}}$ and moderate $U$, while a Kondo singlet phase becomes more stable at large ${J}_{\ensuremath{\perp}}$. The transition from the spiral magnetic order to the Kondo singlet phase is a second-order phase transition. In the $({J}_{\ensuremath{\perp}},{J}_{H})$ plane, we observe that the effect of ${J}_{H}$ is to reduce the Kondo singlet phase, giving more room to the spiral magnetic order phase. It also introduces some small magnetic oscillations of the spiral magnetic order parameter. At finite doping and when spiral magnetism is ignored, we find superconductivity with symmetry order-parameter $d+id$, which breaks time-reversal symmetry. The superconducting order parameter has a dome centered at around $5%$ hole doping, and its amplitude decreases with increasing ${J}_{\ensuremath{\perp}}$. We show that spiral magnetism can coexist with $d+id$ state and that superconductivity is suppressed, indicating that these two phases are in competition.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".