Doping dependence of coupling between charge carriers and bosonic modes in the normal state of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>superconductors
Bibliographic record
Abstract
Recently, the doping dependence of the optical-conductivity scattering rate has been used by Hwang, Timusk, and Gu to gain some insight in the way the coupling between the charge carriers and the bosonic modes in high-${T}_{c}$ superconductors depends on doping. These authors used the extended Drude analysis, which does not take into account the normal-state pseudogap explicitly. In this work, we calculated the optical conductivity within the rotating antiferromagnetism theory, which models explicitly the pseudogap. Then we analyzed the resistivity as a function of temperature $T$ and doping $p$. We extracted the scattering rate $1∕\ensuremath{\tau}$ by fitting the ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ resistivity data. We found that for $p$ smaller than a critical value ${p}_{c}$, $1∕\ensuremath{\tau}$ shows a marginal-Fermi-liquid dependence for $T$ greater than a $p$-dependent temperature ${T}_{\ensuremath{\rho}}^{*}$. But for $T<{T}_{\ensuremath{\rho}}^{*},\phantom{\rule{0.3em}{0ex}}1∕\ensuremath{\tau}$ deviates downward from this law. We attribute this depression to a stronger coupling between the charge carriers and the normal-state bosonic modes. Both this coupling and ${T}_{\ensuremath{\rho}}^{*}$ vanish at ${p}_{c}$ while superconductivity continues to be significant well above it. ${p}_{c}$ is interpreted as a quantum critical point, and ${T}_{\ensuremath{\rho}}^{*}$ as the pseudogap temperature ${T}^{*}$ because it is found to agree with the experimental data on ${T}^{*}$. We propose that a possible candidate for the bosonic modes may be the spin-wave excitations in the rotating frame of the rotating antiferromagnetic order.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".