Home
For authors
Submission status

Current
Archive
Archive (English)
   Volumes 21-40
   Volumes 1-20
   Volumes 41-62
      Volume 62
      Volume 61
      Volume 60
      Volume 59
      Volume 58
      Volume 57
      Volume 56
      Volume 55
      Volume 54
      Volume 53
      Volume 52
      Volume 51
      Volume 50
      Volume 49
      Volume 48
      Volume 47
      Volume 46
      Volume 45
      Volume 44
      Volume 43
      Volume 42
      Volume 41
Search
VOLUME 55 (1992) | ISSUE 11 | PAGE 653
Anomalous behavior of the diamagnetic profile of superconducting niobium near a vacuum boundary
The profile of a static magnetic field penetrating into superconducting niobium films has been measured by specular reflection of polarized thermal neutrons. At a temperature of 4.9 K, a field of 500 Oe penetrates essentially unweakened to a depth ξ = 28 nm at a vacuum interface. The reason is a suppression of the order parameter of the superconductor near the surface. Deeper in the film, the field falls off by a London law with a constant Λ = 45 nm. The measurements were carried out on the SPN polarized-neutron spectrometer of the IBR-2 pulsed reactor of the Joint Institute for Nucelar Research at Dubna.