The flux-line lattice in CaAlSi has been studied by small-angle neutron scattering. A well-defined hexagonal flux-line lattice is seen just above H c 1 in an applied field of only 54 Oe. A 30 ° reorientation of this vortex lattice has been observed in a very low field of 200 Oe. This reorientation transition appears to be first-order and could be explained by nonlocal effects. The magnetic field dependence of the form factor is well-described by a single penetration depth of λ = 1496 ( 1 ) Å and a single coherence length of ξ = 307 ( 1 ) Å at 2 K. At 1.5 K, the penetration depth anisotropy is γ λ = 2.7 ( 1 ) , with the field applied perpendicular to the c axis, and agrees with the coherence length anisotropy determined from critical field measurements.
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First-Order Reorientation Transition of the Flux-Line Lattice in CaAlSi
Biswas, P. K; Lees, M. R; Balakrishnan, G. R; Liao, D. Q; Keeble, D. S; Gavilano, J. L; Egetenmeyer, N. L; Dewhurst, C. D; Paul, D. McK
Follow Physical Review Letters
, Volume 108 (7)
American Physical Society (APS) – Feb 17, 2012
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