Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mi>x</mml:mi></mml:msub></mml:math>CuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mn>4</mml:mn></mml:msub></mml:math>
Bibliographic record
Abstract
In an effort to elucidate the origin of the Curie-like paramagnetism that is generic for heavily overdoped cuprates, we have performed high-transverse-field muon spin rotation (TF-$\ensuremath{\mu}$SR) measurements of La${}_{2\ensuremath{-}x}$Sr${}_{x}$CuO${}_{4}$ single crystals over the Sr content range $0.145\ensuremath{\leqslant}x\ensuremath{\leqslant}0.33$. We show that the $x$ dependence of the previously observed field-induced broadening of the internal magnetic field distribution above the superconducting transition temperature ${T}_{c}$ reflects the presence of two distinct contributions. One of these becomes less pronounced with increasing $x$ and is attributed to diminishing antiferromagnetic correlations. The other grows with increasing $x$, but decreases above $x\ensuremath{\sim}0.30$, and is associated with the Curie-like term in the bulk magnetic susceptibility $\ensuremath{\chi}$. In contrast to the Curie-like term, however, this second contribution to the TF-$\ensuremath{\mu}$SR linewidth extends back into the underdoped regime. Our findings imply a coexistence of antiferromagnetically correlated and paramagnetic moments, with the latter becoming dominant beyond $x\ensuremath{\sim}0.185$. This suggests that the doped holes do not neutralize all Cu spins via the formation of Zhang-Rice singlets. Moreover, the paramagnetic component of the TF-$\ensuremath{\mu}$SR linewidth is explained by holes progressively entering the Cu $3{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ orbital with doping.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.018 | 0.002 |
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".