arxiv: 1201.0174 · v1 · pith:XT7Y2MCXnew · submitted 2011-12-30 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.str-el

First-Order Reorientation of the Flux-Line Lattice in CaAlSi

P.K. Biswas , M.R. Lees , G. Balakrishnan , D.Q. Liao , D.S. Keeble , J.L. Gavilano , N. Egetenmeyer , C.D. Dewhurst

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D.McK. Paul

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classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

keywords fieldlatticereorientationangstromsanisotropyappliedbeencaalsi

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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 Hc1 in an applied field of only 54 Oe. A 30 degree reorientation of this vortex lattice has been observed in a very low field of 200 Oe. This reorientation transition appears to be of first-order and could be explained by non-local effects. The magnetic field dependence of the form factor is well described by a single penetration depth of 1496(1) angstroms and a single coherence length of 307(1) angstroms at 2 K. At 1.5 K the penetration depth anisotropy is 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 of the Flux-Line Lattice in CaAlSi

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