Suppression of metal-to-insulator transition and stabilization of superconductivity by pressure in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Re</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>
Bibliographic record
Abstract
The effect of pressure on the low-temperature states of the ${\mathrm{Re}}_{3}{\mathrm{Ge}}_{7}$ is investigated by both electrical and Hall resistance and magnetization measurements. At ambient pressure, the temperature-dependent resistance of ${\mathrm{Re}}_{3}{\mathrm{Ge}}_{7}$ behaves quasilinearly from room temperature down to 60 K, then undergoes a two-step metal-to-insulator transition (MIT) at temperatures ${T}_{1}=59.4\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ and ${T}_{2}=58.7\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, which may be related to a structural phase transition or occurrence of charge-density wave ordering. Upon applying pressure, the two-step (${T}_{1},\phantom{\rule{0.16em}{0ex}}{T}_{2})$ MIT splits into three steps (${T}_{1},\phantom{\rule{0.16em}{0ex}}{T}_{2}$. and ${T}_{3}$) above 1 GPa, and all traces of MITs are fully suppressed by \ensuremath{\sim}8 GPa. Subsequently, the onset of bulk superconductivity (SC) occurs between 10.8 and 12.2 GPa and persists to our highest pressure of 26.8 GPa. At 12.2 GPa the superconducting transition temperature, ${T}_{c}$, and upper critical field, ${H}_{c}2$ reach the maximum of ${\mathrm{T}}_{\mathrm{c}}$ (onset) \ensuremath{\sim}5.9 K and ${H}_{c}2$ (1.8 K) \ensuremath{\sim}14 kOe. Our results not only present the observation of SC under high pressure in ${\mathrm{Re}}_{3}{\mathrm{Ge}}_{7}$ but also delineate the interplay between SC and other competing electronic states by creating a T-p phase diagram for this potentially topologically nontrivial system ${\mathrm{Re}}_{3}{\mathrm{Ge}}_{7}$.
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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 | 0.004 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.002 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.003 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.219 | 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; 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".