Enhancing superconductivity by disorder | |
Article | |
关键词: HIGH-TEMPERATURE SUPERCONDUCTORS; C CUPRATE SUPERCONDUCTORS; DIRTY SUPERCONDUCTORS; INSULATOR TRANSITION; COHERENCE LENGTH; ZN-SUBSTITUTION; SUPPRESSION; IMPURITIES; ALLOYS; STATE; | |
DOI : 10.1103/PhysRevB.98.184510 | |
来源: SCIE |
【 摘 要 】
We study two mechanisms for enhancing the superconducting mean-field transition temperature T-c by nonmagnetic disorder in both conventional (sign-preserving gaps) and unconventional (sign-changing gaps) superconductors (SCs). In the first scenario, relevant to multiband systems of both conventional and unconventional SCs, we demonstrate how favorable density-of-states enhancements driven by resonant states in off-Fermi-level bands lead to significant enhancements of T-c in the condensate formed by the near-Fermi-level bands. The second scenario focuses on systems close to localization where random disorder-generated local density-of-states modulations cause a boosted T-c even for conventional single-band SCs. We analyze the basic physics of both mechanisms within simplified models, and we discuss the relevance to existing materials.
【 授权许可】
Free