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29 March 2024
 
  » pubmed » pmid11807550

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Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+delta
K M Lang ; V Madhavan ; J E Hoffman ; E W Hudson ; H Eisaki ; S Uchida ; J C Davis ;
Date 24 Jan 2002
Journal Nature, 415 (6870), 412-6
AbstractGranular superconductivity occurs when microscopic superconducting grains are separated by non-superconducting regions; Josephson tunnelling between the grains establishes the macroscopic superconducting state. Although crystals of the copper oxide high-transition-temperature (high-Tc) superconductors are not granular in a structural sense, theory suggests that at low levels of hole doping the holes can become concentrated at certain locations resulting in hole-rich superconducting domains. Granular superconductivity arising from tunnelling between such domains would represent a new view of the underdoped copper oxide superconductors. Here we report scanning tunnelling microscope studies of underdoped Bi2Sr2CaCu2O8+delta that reveal an apparent segregation of the electronic structure into superconducting domains that are approximately 3 nm in size (and local energy gap <50 meV), located in an electronically distinct background. We used scattering resonances at Ni impurity atoms as ’markers’ for local superconductivity; no Ni resonances were detected in any region where the local energy gap Delta > 50 +/- 2.5 meV. These observations suggest that underdoped Bi2Sr2CaCu2O8+delta is a mixture of two different short-range electronic orders with the long-range characteristics of a granular superconductor.
Source PubMed, pmid11807550 doi: 10.1038/415412a
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