Control of Organic Superconducting Field-Effect Transistor by Cooling Rate

Kawaguchi, Genta; Yamamoto, Hiroshi

doi:10.3390/cryst9110605

Cited by 5 publications

(3 citation statements)

References 35 publications

(62 reference statements)

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“…The low temperature state of the device depends on both chemical nature of the bulk and substrate (in addition to cooling rate) since what matters is the differential contraction between bulk and substrate [489,490], see Fig. 107.…”

Section: General Conclusionmentioning

confidence: 99%

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Jerome,

Bourbonnais

2024

Comptes Rendus. Physique

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It is indisputable that the search for high-temperature superconductivity has stimulated the work on low-dimensional organic conductors at its beginning. Since the discovery of true metal-like conduction in molecular compounds more than 50 years ago, it appeared that the chemical composition and the quasi one-dimensional crystalline structure of these conductors were determining factors for their physical properties; materials with incommensurate conduction band filling favoring the low-dimensional electron-phonon diverging channel and the establishment of the Peierls superstructure and more rarely superconductivity at low temperature, while those with commensurate band filling favor either magnetic insulating or superconducting states depending on the intensity of the coupling between conductive chains. In addition, the simple structures of these materials have allowed the development of theoretical models in close cooperation with almost all experimental findings.Even though these materials have not yet given rise to true high-temperature superconductivity, the wealth of their physical properties makes them systems of choice in the field of condensed matter physics due to their original properties and their educational qualities. Research efforts continue in this field. The present retrospective, which does not attempt to be an exhaustive review of the field, provides a set of experimental findings alluding to the theoretical development while a forthcoming article will address in more details the theoretical aspect of low dimensional conductors and superconductors.Résumé. Il est indiscutable que c'est la possibilité d'aboutir à une supraconduction de haute température qui a stimulé le démarrage des recherches sur les conducteurs organiques. Suite à la découverte il y a plus de 50 ans, d'une conduction de type métallique dans des composés moléculaires, il est apparu que la composition chimique, la structure cristalline quasi-unidimensionnelle sont des facteurs qui déterminent les propriétés physiques de ces matériaux ; un remplissage de bande incommensurable favorisant généralement

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Section: General Conclusionmentioning

confidence: 99%

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Jerome,

Bourbonnais

2024

Comptes Rendus. Physique

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“…These numerical methods have been used to approximate the solution of the heat diffusion equation in large and complex problems such as the analysis of fractal piping design [34], phase change materials [35], enhanced surfaces [36], heat exchangers [37], heat sinks [38] and additive manufacturing [39,40], among others. In addition, these and other numerical techniques have been used to study the rate of change of temperature to time in crystallization [2,41], microstructural evolution [42], and superconducting devices [43].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis for Transient Thermal Problems Using the Complex-Variable Finite Element Method

et al. 2022

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Solving transient heat transfer equations is required to understand the evolution of temperature and heat flux. This physics is highly dependent on the materials and environmental conditions. If these factors change with time and temperature, the process becomes nonlinear and numerical methods are required to predict the thermal response. Numerical tools are even more relevant when the number of parameters influencing the model is large, and it is necessary to isolate the most influential variables. In this regard, sensitivity analysis can be conducted to increase the process understanding and identify those variables. Here, we combine the complex-variable differentiation theory with the finite element formulation for transient heat transfer, allowing one to compute efficient and accurate first-order sensitivities. Although this approach takes advantage of complex algebra to calculate sensitivities, the method is implemented with real-variable solvers, facilitating the application within commercial software. We present this new methodology in a numerical example using the commercial software Abaqus. The calculation of sensitivities for the temperature and heat flux with respect to temperature-dependent material properties, boundary conditions, geometric parameters, and time are demonstrated. To highlight, the new sensitivity method showed step-size independence, mesh perturbation independence, and reduced computational time contrasting traditional sensitivity analysis methods such as finite differentiation.

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“…The crystal engineering rationally designs molecular quantum materials via supramolecular assembly, and supramolecular architectures feature conformational peculiarities of molecular contact and arrangement to uncover exotic molecular magnetism, − superconductivity, − and multiferroicity. − In this context, crystal engineering principles have been successfully applied onto bis(ethylenedithio)tetrathiafulvalene (ET) π-electron donor systems by alternatively stacking with hybrid organic–inorganic nonmagnetic anions. A variety of stacking modes, α-, θ-, κ-, and β-type, make ET-based quantum materials promising candidates for studying the coupling of multiple degrees of charge, spin, and lattice and their interplay in molecular quantum systems, ,− leading to molecular superconductors, , Mott insulators, − quantum spin liquid, and multiferroics. − However, bulk ferromagnetic order has not been established in those two-dimensional (2D) ET based systems, in which ET cations and polymeric anions are primarily 2D layered stacking by π–π interactions. Even though intralayer antiferromagnetism with weak ferromagnetic canting is revealed in κ-(ET) 2 Cu[N(CN) 2 ]Cl, the origin of magnetic order is still ambiguous because of a lack of appropriate investigation candidates.…”

Section: Introductionmentioning

confidence: 99%

Emerged Metallicity in Molecular Ferromagnetic Wires

et al. 2021

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Supramolecular engineering bridges molecular assembly with macromolecular charge-transfer salts, promising the design to construct supramolecular architectures that integrate cooperative properties difficult or impossible to find in conventional lattices. Here, we report the crystal engineering design and kinetic growth of one-dimensional supramolecular wires composed of bis(ethylenedithio)tetrathiafulvalene (ET + ) cation and polymeric Cu[N(CN) 2 ] 2 − anion. A bulk ferromagnetic order is discovered for filling up the gap where strong ferromagnetism is missing in such ET molecule-based charge-transfer salts. Metallicity is induced by electric current from the semiconducting wire, which is attributed to strain effect by tuning its close molecular contact. This structural feature is evidenced through the combination of various mechanistic spectroscopic studies. Electric dipole is established from the close molecular contacts and is suggestive to stabilize ferromagnetic spin interaction through anions bridging spin sites. The breakthrough shown here provides a pathway to explore low-dimensional supramolecular materials exhibiting strong electron correlation, metallicity, and ferromagnetism.

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Control of Organic Superconducting Field-Effect Transistor by Cooling Rate

Cited by 5 publications

References 35 publications

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Quasi one-dimensional organic conductors: from Fröhlich conductivity and Peierls insulating state to magnetically-mediated superconductivity, a retrospective

Sensitivity Analysis for Transient Thermal Problems Using the Complex-Variable Finite Element Method

Emerged Metallicity in Molecular Ferromagnetic Wires

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