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Enhancing superconductivity by disorder
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DOI：10.1103/PhysRevB.98.184510.png)
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摘要
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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.
Keyword:
HIGH-TEMPERATURE SUPERCONDUCTORS
C CUPRATE SUPERCONDUCTORS
DIRTY SUPERCONDUCTORS
INSULATOR TRANSITION
COHERENCE LENGTH
ZN-SUBSTITUTION
SUPPRESSION
IMPURITIES
ALLOYS
STATE
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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