Designing high-TC superconductors with BCS-inspired screening, density functional theory, and deep-learning
نویسندگان
چکیده
We develop a multi-step workflow for the discovery of conventional superconductors, starting with Bardeen Cooper Schrieffer inspired pre-screening 1736 materials high Debye temperature and electronic density states. Next, we perform electron-phonon coupling calculations 1058 them to establish large systematic database BCS superconducting properties. Using McMillan-Allen-Dynes formula, identify 105 dynamically stable transition temperatures, Tc>5 K. Additionally, analyze trends in our dataset individual including MoN, VC, VTe, KB6, Ru3NbC, V3Pt, ScN, LaN2, RuO2, TaC. demonstrate that deep-learning(DL) models can predict superconductor properties faster than direct first principles computations. Notably, find by predicting Eliashberg function as an intermediate quantity, improve model performance versus DL prediction Tc. apply trained on crystallographic open pre-screen candidates further DFT calculations.
منابع مشابه
Cross-over from BCS superconductivity to Bose condensation and high-Tc superconductors
We consider the Eliashberg theory in the coupling region where some fundamental qualitative deviations from the conventional BCS-like behaviour begin to appear. These deviations are identified as the onset of a cross-over from BCS superconductivity to Bose condensation. We point out that the beginning of this cross-over occurs when the gap ∆g becomes comparable to the boson energies Ωph. This c...
متن کاملMagnetism and high Tc superconductors
The magnetic properties of the copper oxide planes in hight T~ superconductors are represented by a planar 2-d antiferromagnet on a square lattice. We model the magnetic effect of the addition of holes through doping by the replacement of antiferromagnetic with ferromagnetic plaquettes thereby facilitating the creation of vorticeslantivortices. These magnetic
متن کاملQuasiparticle density of states in dirty high-Tc superconductors
We study the density of quasiparticle states of dirty d-wave superconductors. We show the existence of singular corrections to the density of states due to quantum interference effects. We then argue that the density of states actually vanishes in the localized phase as uEu or E depending on whether time-reversal is a good symmetry or not. We verify this result for systems without time-reversal...
متن کاملTheory for underdoped high-Tc superconductors: effects of phase fluctuations
In underdoped cuprates, Tc is thought to be determined by Cooper pair phase fluctuations because of the small superfluid density ns. Experimentally, Tc is found to scale with ns. The fluctuation-exchange approximation (FLEX) in its standard form fails to predict this behavior of Tc since it does not include phase fluctuations. We therefore extend the FLEX to include them selfconsistently. We pr...
متن کاملQuasiclassical Theory of Twin Boundaries in High-Tc Superconductors
We investigate the electronic structure of twin boundaries in orthorhombically distorted high-Tc materials using the quasiclassical theory of superconductivity. At low temperatures we find a local instability to a time-reversal symmetry breaking state at the twin boundary. This state yields spontaneous currents along the twin boundary that are microscopically explained by the structure of the q...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: npj computational materials
سال: 2022
ISSN: ['2057-3960']
DOI: https://doi.org/10.1038/s41524-022-00933-1