Creep and depinning of vortices in a nontwinned YBa2Cu3O6.87 single crystal
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Bibliographic record
Abstract
We present the results of a transport study of vortex dynamics in YBa2Cu3O6.87 crystals in magnetic field H∥c. At low magnetic fields, H<4kOe, the measurements were performed in the range of vortex velocities v=10−4–2m∕s, which covers the thermal creep and flux flow modes. The pinning force Fp depends nonmonotonically on magnetic field in both modes, though the low-field minimum in the Fp(H) curve shifts to higher fields with increasing velocity v, which is interpreted as partial ordering of the vortex lattice. The increase of the pinning force Fp with increasing field, which is observed in the flux flow mode in fields H⩾3kOe, is interpreted by the presence of finite transverse barriers. The barriers result in preserving the entangled vortex solid phase for the above-barrier vortex motion along the action of the Lorentz force. We also show that field variation of the depinning current has a single maximum, while the field variation of the pinning force in the deep creep mode has two maxima. The appearance of two maxima is associated with nonmonotonic field variation of the activation energy Upl, which corresponds to plastic vortex creep mediated by the motion of dislocations.
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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 | 0.000 | 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 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 it