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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author 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,
Project Interplay of Magnetism and Superconductivity in Unconventional Superconductors
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Original article (peer-reviewed)

Journal Physical review letters
Volume (Issue) 108(7)
Page(s) 077001-1 - 077001
Title of proceedings Physical review letters

Abstract

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.
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