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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.006 | 0.003 |
| Meta-epidemiology (narrow) | 0.004 | 0.007 |
| Meta-epidemiology (broad) | 0.002 | 0.007 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.005 | 0.004 |
| Scholarly communication | 0.004 | 0.009 |
| Open science | 0.007 | 0.007 |
| Research integrity | 0.005 | 0.007 |
| Insufficient payload (model declined to judge) | 0.054 | 0.013 |
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; both teacher heads agree on what is shown here.
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".