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Record W4392339141

Theoretical study of the spin crossover in a single Fe(phen)2(NCS)2 molecule adsorbed onto metallic substrates

2014· preprint· fr· W4392339141 on OpenAlexaboutno aff
Saber Gueddida∥

Bibliographic record

Venuetheses.fr (ABES) · 2014
Typepreprint
Languagefr
FieldMaterials Science
TopicMagnetism in coordination complexes
Canadian institutionsnot available
Fundersnot available
KeywordsSpin crossoverMoleculeMetalAdsorptionSpin (aerodynamics)Materials scienceCrossoverNanotechnologyCrystallographyChemistryChemical physicsPhysical chemistryPhysicsMetallurgyOrganic chemistryComputer scienceThermodynamics
DOInot available

Abstract

fetched live from OpenAlex

L’objectif principal de cette thèse est d’utiliser le calcul ab initio fondé sur la théorie de la densité fonctionnelle (DFT) pour calculer et comprendre la transition HS-BS de la molécule FePhen adsorbée sur un substrat métallique. Il s’agit d’abord de décrire les interactions entre FePhen et un substrat métallique ferromagnétique, comme le Co, ou un substrat paramagnétique comme l’or ou le cuivre. Nous avons calculé la barrière de potentiel nécessaire pour basculer la molécule de l’état BS à l’état HS en utilisant la méthode ’Nudged Elastic Band’ (NEB) et développé une méthode basée sur les principes de la méthode NEB, pour déterminer la trajectoire d’énergie minimale (TEM) de la molécule adsorbée sur un substrat métallique. Nous avons calculé le couplage ferromagnétique entre la molécule et le cobalt en fonction du nombre de couches intermédiaires de cuivre. Nous avons étudié en particulier (1) le rôle joué par les interactions van der Waals, (2) la modélisation de la microscopie à effet tunnel (STM) et (3) les propriétés de transport. Nous avons calculé les images STM en utilisant l’approximation de Tersoff et Hamann, qui montrent un bon accord avec les résultats expérimentaux. Nous vons étudié les propriétés de transport de la molécule FePhen adsorbée sur une surface métallique, en utilisant le code Smeagol basé sur la méthode des fonctions de Green hors-équilibre, et le formalisme de Landauer.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not 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.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.006
Threshold uncertainty score0.019

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0010.001
Scholarly communication0.0000.001
Open science0.0010.000
Research integrity0.0010.000
Insufficient payload (model declined to judge)0.0060.000

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.

Opus teacher head0.032
GPT teacher head0.291
Teacher spread0.259 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designTheoretical or conceptual
Domainnot available
GenreEmpirical

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".

Quick stats

Citations0
Published2014
Admission routes1
Has abstractyes

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Same venuetheses.fr (ABES)Same topicMagnetism in coordination complexesFrench-language works237,207