Ultrasonic investigation of the P-T phase diagram of κ-(BEDT-TTF)<sub>2</sub>X organic superconductors
Bibliographic record
Abstract
Depending on the exact pressure conditions (hydrostatic or chemical by anion X substitution), the normal phase of the κ-(BEDT-TTF) 2 X organic conductors is either a Mott insulator and/or an unconventional metal. Among them, κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl stands as the prototype material since it shows the complete sequence of states within a pressure interval of a few hundreds bars. Ultrasonic waves constitute excellent tools to probe such electronic states but experiments on organics are scarce due their brittleness and very small dimensions. We present a recent ultrasonic study of a few κ-(BEDT-TTF) 2 X organic compounds under hydrostatic pressure conditions. Different phase transitions are identified trough several elastic anomalies characterized from isobaric and isothermal sweeps. Beyond the confirmation of the P-T diagram of a typical Mott material, our ultrasonic data on the κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl conductor allows a detailed study of the critical point region. The very large softening of the velocity at the critical point corresponds to the predicted compressibility divergence of the electronic degrees of freedom and validates then, the DMFT picture of the Mott transition. Most importantly, our data reveal that the high pressure crossover line coincides with the pseudogap features previously observed in magnetic and transport properties. Impurity and crystal quality effects on the phase diagram will also be discussed.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".