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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 1 Issue 1 (1998) pp 5-9
Experimental observation of lattice distortions due to a flux line lattice in niobium
K.-U. Neumann (1) (a), F. Kusmartsev (1), H.-J. Lauter (2), O. Schärpf (3), T.J. Smith (1), K.R.A. Ziebeck (1)
(1) Department of Physics, Loughborough University, Loughborough LE11 3TU, UK
(2) Institut Laue-Langevin, rue des Martyrs, 38042 Grenoble Cedex, France
(3) Physik-Department E13, Techn. Universität München, James-Frank-Strasse 1, 85748 Garching, Germany
Received: 8 August 1997 / Accepted: 16 October 1997
Abstract: A polarized neutron scattering investigation of the flux line lattice in the type-II superconductor niobium is reported. A modulation of the nuclear lattice has been detected, and the magnitude of the first Fourier component of the lattice distortion established relative to the magnitude of the magnetic scattering. This constitutes the first experimental observation of lattice distortions due to the presence of magnetic flux lines within the bulk of a type-II superconductor. Using a simple microscopic model the lattice distortion in niobium is estimated. A new mechanism is suggested for the coupling of the flux line lattice to the crystallographic lattice. The experimental technique opens up the possibility of investigating the microscopic mechanism of flux line - nuclear lattice interactions, in particular the pinning of flux lines within the bulk of a type-II superconductor.
PACS. 74.60.- w Type-II superconductivity - 78.70.Nx Neutron inelastic scattering
(a) e-mail: K.U.Neumann@Lboro.ac.uk
Online publication: February 4, 1998
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