Observation of Landau-Type Branching in the Intermediate State

  • J. F. Allen
  • R. A. Lerski


In the original form of Landau’s 1 theory of the intermediate state macroscopic superconducting and normal laminae were assumed to emerge from the interior of the specimen metal more or less unchanged apart from a spreading out of the normal laminae when approaching the metal surface. However, since the local field is equal to H c , on the interface, the field in the middle of a normal lamina must drop below H c , when it spreads out. This led Landau to the development of a branching model2 in which the normal laminae were supposed to split first into two, then four laminae, etc., becoming finely divided as they approached the surface of the superconductor. An alternative system of branched threads, rather than laminae, was considered by Andrew3 in an attempt to explain the restoration of resistance to a superconducting cylinder in a transverse field.


Transverse Field Specimen Metal Landau Model Cobalt Powder Interlamina Spacing 
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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • J. F. Allen
    • 1
  • R. A. Lerski
    • 1
  1. 1.Department of PhysicsUniversity of St. AndrewsNorth Haugh, St. Andrews FifeScotland

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