Pl. Gammel et al., SMALL-ANGLE NEUTRON-SCATTERING STUDY OF THE MAGNETIC FLUX-LINE-LATTICE IN SINGLE-CRYSTAL 2H-NBSE2, Physical review letters, 72(2), 1994, pp. 278-281
We report on a small angle neutron scattering study of the flux-line l
attice in single crystal 2H-NbSe2. As the magnetic field is tilted awa
y from the crystalline c axis, we find distortions in the flux lattice
as would be expected for a mass anisotropy GAMMA = 10.1 +/- 0.9. Howe
ver, we find that the lattice orientation is in disagreement with the
predictions of both anisotropic London and Ginzburg-Landau theories. T
he observed flux lattice orientation remains pinned to that of the cry
stal lattice for the field orientations studied. The form factors can
be quantitatively understood within the framework of Ginzburg-Landau c
orrections to the London equations.