High-pressure study of structural phase transitions and superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>1.48</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Nd</mml:mi><mml:mn>0.4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>0.12</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
We have determined the crystal structures and superconducting transition temperatures of ${\mathrm{La}}_{1.48}{\mathrm{Nd}}_{0.4}{\mathrm{Sr}}_{0.12}\mathrm{Cu}{\mathrm{O}}_{4}$ under nearly hydrostatic pressures in diamond anvil cells to $5.0\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $19.0\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, respectively. Synchrotron x-ray powder diffraction measurements were used to establish the pressure-temperature structural phase diagram. Under pressure the superconducting transition temperature increases rapidly from ${T}_{c}\ensuremath{\approx}3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ to a maximum value of $22\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ at $5\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$, a pressure slightly greater than that required to stabilize the undistorted $I\mathit{4}∕mmm$ structure in the superconducting state. Increasing the pressure further to $19\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ leads to a decrease in ${T}_{c}$ to $\ensuremath{\sim}12\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. These results are discussed in relation to earlier high pressure measurements for similar materials.
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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 | 0.008 |
| Meta-epidemiology (broad) | 0.002 | 0.007 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.006 | 0.006 |
| Scholarly communication | 0.005 | 0.011 |
| Open science | 0.008 | 0.007 |
| Research integrity | 0.006 | 0.008 |
| Insufficient payload (model declined to judge) | 0.742 | 0.005 |
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".