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These results provide interesting insight into the origin of superconductivity in this novel series of compounds.
Journal ArticleDOI
B. T. Matthias, J. L. Olsen 
01 Dec 1964-Physics Letters
25 Citations
This observation supports the view that superconductivity is a general phenomenon.
These two successful examples demonstrate the importance of ab initio approach to superconductivity.
Open accessJournal ArticleDOI
33 Citations
This hypothesis is consistent with the theory of hole superconductivity.
As such, these results may provide crucial tests of mechanisms of superconductivity.
Open accessJournal ArticleDOI
33 Citations
This indicates a fundamental problem with the conventional theory of superconductivity.
Open accessJournal ArticleDOI
2 Citations
These experimental results impose a restriction on the mechanism of the superconductivity.

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Who first discovered pcos?4 answersPolycystic ovary syndrome (PCOS) was first described by Antonio Vallisneri in 1721, noting enlarged ovaries in an infertile woman. However, Stein and Leventhal are commonly credited with the initial investigation of PCOS in 1935, linking cycle irregularities and hirsutism to ovarian abnormalities. Over time, diagnostic criteria evolved, with the Rotterdam criteria in 2003 becoming widely accepted, requiring the presence of oligo/anovulation, hyperandrogenism, and polycystic ovarian morphology for diagnosis. The syndrome's association with insulin resistance was later established, influencing management strategies and highlighting its metabolic implications. These historical milestones have shaped our understanding of PCOS, emphasizing its complexity and diverse clinical manifestations.
What is up with room temperature superconductivity?4 answersRoom temperature superconductivity has been a long-standing goal in the field. Recent advancements have shown promise in achieving this goal. One approach is the synthesis of hydrogen-based superconductors under high pressures, such as H3S, LaH10, and C-S-H compounds. Another approach involves the exploration of new materials using computational methods, which has led to the discovery of superconductivity in hydrides like SH3, LaH10, and YH9 at high pressures. Additionally, there have been interesting findings regarding the possibility of room temperature superconductivity in doped graphite or at its interfaces. Furthermore, research has focused on conventional superconductivity in metals and alloys, leading to the discovery of near-room-temperature superconductivity in metal hydrides and high-entropy alloy superconductors. In the search for moderately high critical temperatures, new superconducting phases have been observed in the scandium borocarbide system. These advancements provide hope for the realization of room temperature superconductivity and continue to drive further research in the field.
Can iron be superconductor?5 answersIron-based superconductors (IBSCs) have been discovered and extensively studied since 2006-2008. Initially, the presence of iron with a large magnetic moment was believed to hinder the emergence of superconductivity. However, the discovery of IBSCs challenged this notion and established a new class of high critical temperature (Tc) superconductors. Theoretical models have been proposed to understand the pairing mechanism and calculate Tc values for IBSCs. Recent models suggest that the superconducting electron concentration and the antiferromagnetism-induced xy potential can have a significant effect on electron-phonon coupling. The iron-Majorana platform, which combines high-Tc superconductivity with a topological band structure, shows promise for hosting Majorana zero modes. Additionally, iron-based superconductors have distinct characteristics and potential applications, making them an interesting area of research.
What is the relationship between the Hubbard model and superconductivity?5 answersThe Hubbard model is a fundamental starting point for understanding superconductivity in correlated electron materials. Recent numerical simulations suggest that the emergence of superconductivity is connected to the next nearest-neighbor hopping in the Hubbard model. The impacts of complex inter-site electron interaction in the Hubbard model are less explored. However, utilizing advanced computational methods, it has been found that the superconducting correlation remains stable even under repulsive nearest-neighbor and next nearest-neighbor interactions, which are against superconductivity. In addition, experiments on cuprate superconductors suggest that an effective attraction between nearest neighbors may exist, which significantly enhances the superconducting correlation when it is comparable to the strength of the nearest-neighbor hopping. These findings validate the applicability of the Hubbard model in describing cuprate high-temperature superconductivity.
Is superconductor and superconductivity same?6 answers
Who discovered the first electronic amplifier?7 answers

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How does precipitate spatial distribution affect thermoelectric performance?
4 answers
The spatial distribution of precipitates significantly impacts thermoelectric performance. In SiGe alloys, deviations in precipitation rates due to experimental procedures can lead to increased diffusion and more defects, affecting thermoelectric performance. In BaCu2Te2, controlling Cu content to form Cu-rich nano-precipitates enhances phonon scattering, reducing thermal conductivity and improving the thermoelectric figure of merit zT. Additionally, in AgSbTe2 nanocomposites, the presence of Ag2Te precipitates enhances thermoelectric properties by acting as energy filters, increasing the Seebeck coefficient. These findings highlight the crucial role of precipitate spatial distribution in optimizing thermoelectric performance through enhanced phonon scattering and improved Seebeck coefficient.
What are the current technological applications of cuprate superconductors?
4 answers
Cuprate superconductors, known for their high-temperature superconductivity, find applications in various technological fields. They are crucial for applications in medical imagery, motors, generators, power cables, levitation trains, and fusion magnets. Additionally, advancements in rare-earth, cuprate-based bulk superconductors have led to their use in hybrid trapped field magnetic lensing, high-performance magnetic shields, large-gradient magnetic separation, and bench-top NMR/MRI ring-shaped stacks. The crystal structures and properties of cuprate superconductors like YBCO, Bi-2212, and Bi-2223 are essential for their applications, including creating flux pinning sites to increase critical current density. Moreover, the discovery of iron-based high-temperature superconductors has expanded the range of applications for cuprate superconductors.
What is the structure of La3Ni2O7?
5 answers
The structure of La3Ni2O7 is orthorhombic with an Fmmm space group, where the Ni cations' 3d_(x^2-y^2) and 3d_(z^2) orbitals strongly interact with oxygen 2p orbitals. Under high pressure, this compound exhibits superconductivity with a maximum Tc of 80 Kelvin, observed between 14.0-43.5 gigapascals. The superconducting phase coincides with the metallization of the σ-bonding bands under the Fermi level, involving the 3d_(z^2) orbitals with apical oxygens connecting Ni-O bilayers. The high-pressure phase also shows charge ordering and a single active 3d_(z^2) orbital per unit cell, indicating nonlocal correlation and screening effects. This discovery not only sheds light on high-Tc superconductivity mechanisms but also introduces a new family of compounds for further investigation.
What is the crystal structure of La3Ni2O7?
4 answers
The crystal structure of La3Ni2O7 is orthorhombic with an Fmmm space group, as reported in Context_2. This structure involves strong interactions between the 3d_(x^2-y^2) and 3d_(z^2) orbitals of Ni cations and oxygen 2p orbitals. The superconducting phase of La3Ni2O7 under high pressure exhibits this specific crystal structure, coinciding with the emergence of superconductivity at pressures between 14.0-43.5 gigapascals. Additionally, the charge and spin order in La3Ni2O7, as discussed in Context_4, further elucidates the structural and electronic characteristics of this compound. The presence of Fe ions in the La3Ni2-xFexO7±δ solid solutions, as mentioned in Context_5, also contributes to understanding the crystal structure and composition of La3Ni2O7. These findings collectively provide insights into the complex crystallographic features of La3Ni2O7.
What is the structure of La3Ni2O7 at high pressure?
5 answers
At high pressure, La3Ni2O7 exhibits an orthorhombic structure of the Fmmm space group. The superconducting phase in La3Ni2O7 under high pressure is characterized by the strong interaction between the 3d_(x^2-y^2) and 3d_(z^2) orbitals of Ni cations with the oxygen 2p orbitals. Density functional theory calculations suggest that superconductivity emerges concurrently with the metallization of the σ-bonding bands under the Fermi level, which consist of the 3d_(z^2) orbitals interacting with the apical oxygens connecting Ni-O bilayers. This structural information provides crucial insights into the high-Tc superconductivity observed in La3Ni2O7 at elevated pressures, offering a new avenue for investigating superconductivity mechanisms in this compound.
What solvent and solute ratio is the best?
4 answers
The optimal solvent and solute ratio can vary based on the specific system and properties being studied. Research by Goozner and Labeshighlights that the phase transition temperatures can exhibit complex behavior, including enhancements, decreases, and maxima as a function of solute concentration. Aswal et al.observed that the nucleation temperature of NdBa2Cu3Ox can be influenced by the solute-to-solvent molar ratio and cooling rate. Additionally, Hamad et al.derived new relations among concentration fluctuation integrals in mixtures, providing insights into the interplay of different components. Vyalov et al.conducted extensive molecular simulations to understand solute-solvent interactions, emphasizing the importance of considering solute-solvent size ratios. Therefore, the best solvent and solute ratio depend on the specific experimental or theoretical context and the desired outcome.
Is there a peper from Schlüter?
4 answers
Yes, there is a paper related to Pfirsch-Schluter in the provided contexts. The Pfirsch-Schluter flow has been studied in various plasma devices like the Large Helical Device (LHD), stellarators, and tokamaks. In LHD, the Pfirsch-Schluter flow has been found to significantly impact the toroidal flow asymmetry, especially in scenarios with large radial electric fields. Additionally, the presence of impurities in stellarators affects impurity transport and the radial electric field, with pressure anisotropy playing a crucial role. The Pfirsch-Schluter current and pressure profiles have been estimated in high-density electron cyclotron heating plasmas in Heliotron DR, showcasing the importance of understanding these phenomena in different plasma confinement devices.
Can be used nonconductor to nonoclusters synthesis?
5 answers
Nonconductor materials can indeed be utilized in various synthesis processes, such as nonoclusters synthesis. By immersing a nonconductor product in a semiconductor-powder-suspended liquid and irradiating it with light, polar radicals can be formed on its surface, enabling subsequent electroless plating. Additionally, nonconductor surface metallizing processes can be applied for improved circuit board production without the need for leveling agents, showcasing controllable and reliable metallizing techniques. Furthermore, atmospheric-pressure plasma flame discharges can be employed for synthesizing various chemistries without catalysts, expanding the possibilities for nonconductor material treatments and synthesis. These diverse methods highlight the versatility and potential of utilizing nonconductor materials in various synthesis processes, including the synthesis of nanoclusters.
What are the models used to predict SUPERCONDUCTORS MATERIAL PROPERTIES UNDER MACHINE LEARNING?
5 answers
Machine learning models are extensively utilized to predict superconductor material properties. Various approaches include using a dataset of electron-phonon calculations to train models for predicting electron-phonon and superconducting properties, such as transition temperature (Tc). Additionally, classifiers are employed to reduce material descriptors and predict critical temperatures of inorganic compounds, with Bayesian classifiers showing promise. Natural language processing models are developed to extract information from abstracts, predicting physical and chemical properties like superconducting transition temperatures with a mean absolute error of 15 K. Another method involves training machine learning models on known superconductors to predict critical temperatures of novel chemical compositions, resulting in the identification of high-temperature superconductors. Lastly, ML models are trained to predict electron-phonon parameters, enabling the identification of potential superconductors with Tc around 10-15 K at zero pressure.
Are supervised learning, unsupervised learning, and reinforcement learning used in the study of superconducting materials?
5 answers
Supervised learning, unsupervised learning, and reinforcement learning are indeed utilized in the study of superconducting materials. Various studies have employed machine learning techniques such as supervised classification and regression models, natural language processing models for information extraction, and XGBoost models for identifying superconductors and predicting critical temperatures. These approaches have enabled the automatic extraction of material properties, prediction of superconducting transition temperatures, and identification of candidate superconducting materials with high critical temperatures. Additionally, deep neural networks have been trained using different descriptors to analyze cuprates as potential superconducting candidates. The integration of machine learning methodologies has significantly advanced the exploration and understanding of superconducting materials.
Whats the magnetic measurements labratory method
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The magnetic measurements laboratory methods encompass various techniques such as the extraction method, vibrating sample magnetometer, SQUID magnetometer, and digital methods for hysteresis loop measurements. These methods involve utilizing specialized equipment like Pulsed Field Magnetometry for extra-hard magnets, high-speed stroboscopical Kerr techniques for observing domain wall dynamics, and calorimetry in magnetic fields for entropy measurements in magnetocaloric materials. Additionally, the development of software-based hardware-software measuring complexes allows for digital measurement and registration of dynamic hysteresis loops in magneto-soft materials, providing precise data processing capabilities. The integration of advanced technologies like Hall probes and flip coils in magnetic field measurement systems further enhances the accuracy and resolution of magnetic field characterization.