First-order reorientation transition of the flux-line lattice in CaAlSi

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(c1) 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 tr...

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Bibliographic Details
Published in:Physical review letters 2012-02, Vol.108 (7), p.077001-077001, Article 077001
Main Authors: Biswas, P K, Lees, M R, Balakrishnan, G, Liao, D Q, Keeble, D S, Gavilano, J L, Egetenmeyer, N, Dewhurst, C D, Paul, D McK
Format: Article
Language:English
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Summary: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(c1) 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.108.077001