Anisotropy in the flux-line lattice symmetry of a low-kappa Type-II superconductor

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Correlation between the symmetry of the two-dimensional flux-line lattice (FLL) and the real crystal lattice (CL) has been studied in a superconducting niobium sphere by means of small-angle neutron diffraction. A double-perfect silicon-crystal diffractometer enabled precise determination of the three inter-fluxoid distances corresponding to th e FFL basic cell. A systematic study of the anisotropic behavior was made as a function of temperature and magnetic-field amplitude for fields parallel to a few high-symmetry CL axes in the (1 anti 1 0) plane. In addition, at T = 4.30 K progressive deformation of the FLL was studied as the sample was ... continued below

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Pages: 19

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Thorel, P. & Christen, D.K. January 1, 1977.

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Correlation between the symmetry of the two-dimensional flux-line lattice (FLL) and the real crystal lattice (CL) has been studied in a superconducting niobium sphere by means of small-angle neutron diffraction. A double-perfect silicon-crystal diffractometer enabled precise determination of the three inter-fluxoid distances corresponding to th e FFL basic cell. A systematic study of the anisotropic behavior was made as a function of temperature and magnetic-field amplitude for fields parallel to a few high-symmetry CL axes in the (1 anti 1 0) plane. In addition, at T = 4.30 K progressive deformation of the FLL was studied as the sample was rotated in the (1 anti 1 0) and (100) planes. The FLL was found to be hexagonal only for fields parallel to the three-fold CL axis. Two-fold symmetry prevailed for other CL directions in these planes except near the four-fold axis, where either of two distorted triangular lattices existed, preserving the reflection symmetry in composite, but not individually. This behavior will be discussed in terms of current models for fluxoid-CL interactions; in particular, in terms of the extension of the Takanaka theory done by Delrieu, Roger, and Kahn.

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Pages: 19

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Dep. NTIS, PC A02/MF A01.

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  • 4. international conference on small angle scattering of neutrons and x-rays, Gatlinburg, TN, USA, 1 Oct 1977

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  • Report No.: CONF-771077-1
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5269910
  • Archival Resource Key: ark:/67531/metadc1070591

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1977

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 20, 2018, 10:06 p.m.

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Thorel, P. & Christen, D.K. Anisotropy in the flux-line lattice symmetry of a low-kappa Type-II superconductor, article, January 1, 1977; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1070591/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.