( 1), one can envisage engineering the electronic structure and electron–boson coupling to optimize T c. Furthermore, by analyzing how these available knobs couple to the normal-state properties on the right side of Eq. ( 1)-viz., 1 ≫ λ > μ *-increasing λ (increasing μ *) generally enhances (suppresses) T c, respectively, assuming that superconductivity remains the dominant instability.Įxperimental methods that boost T c are highly desired from a practical perspective. Note that within the range of validity of Eq. For simplicity, we assume that all of the non-isotropic q- and k-dependencies that appear in a more realistic formulation of Cooper pairing have been averaged away. Where N( E F) is the density of states (DOS) near the Fermi level, λ is the electron–boson coupling strength, and μ * is the Coulomb pseudopotential that describes the residual Coulomb repulsion between quasiparticles 2. We demonstrate that synthesizing RuO 2 thin films on (110)-oriented TiO 2 substrates enhances the density of states near the Fermi level, which stabilizes superconductivity under strain, and suggests that a promising strategy to create new transition-metal superconductors is to apply judiciously chosen anisotropic strains that redistribute carriers within the low-energy manifold of d orbitals. Here, we report the transmutation of a normal metal into a superconductor through the application of epitaxial strain. For instance, the ability to deterministically enhance the superconducting transition temperature by design, rather than by serendipity, has been a long sought-after goal in condensed matter physics and materials science, but achieving this objective may require new tools, techniques and approaches. Despite over 100 years of research, a detailed understanding of how features of the normal-state electronic structure determine superconducting properties has remained elusive. Superconductivity is among the most fascinating and well-studied quantum states of matter.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |