Charge order quenching, Griffiths phase, and magnetotransport in polycrystalline Pr<sub>0.58</sub>Ca<sub>0.42−<i>y</i></sub>Sr<sub><i>y</i></sub>MnO<sub>3</sub> thin films
Bibliographic record
Abstract
Abstract We report the magneto‐electrical properties of polycrystalline Pr0.58Ca0.42−ySryMnO3 thin films as function of Sr doping (y). These films (thickness ∼300 nm) prepared by spray pyrolysis on LaAlO3 (100) single crystalline substrates are single phase and have orthorhombic structure. The Sr free films show charge ordering (CO) transition at TCO ≈ 240 K and the magnetic ground state has metamagnetic nature akin to the cluster glass (CG). Sr doping quenches CO and induces paramagnetic–ferromagnetic (PM–FM) transition with a systematic destabilization of the CG state. The PM–FM transition occurs at TC ≈ 182, 218, and 250 K for y = 0.06, 0.12, and 0.22, respectively. The Sr doping induced CO quenching also gives rise to the Griffiths phase (GP) at a temperature TG > TC. The resistivity of the Sr free films shows insulating behavior typical to the CO state. An insulator–metal transition (IMT) is observed at TIM ≈ 198 K in the y = 0.06 film, which increases to 225 and 265 K at y = 0.12 and 0.22, respectively. At y = 0.12, the sharpest IMT that results in huge temperature coefficient of resistivity (TCR) ≈19%, suggests the occurrence of a bicritical state. The bicriticality is also supported by a huge low field magnetoresistance ≈40% at 3 kOe and colossal magnetoresistance ≈90% at moderate magnetic field of 10 kOe. The destabilization of the CO, the appearance of GP, and the bicritical state has been explained in terms of the phase fluctuations induced by Sr doping dependent quenched disorder.
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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) | 0.001 | 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 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".