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

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

2011-12-30

arxiv.org/abs/1201.0174v1

Physical Review Letters 108, 077001 (2012)

Physics

Condensed Matter

Superconductivity

5 pages including 6 figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.108.077001

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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