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 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.003 | 0.001 |
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".