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First-order reorientation transition of the flux-line lattice in CaAlSi
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Biswas, P. K. (Pabitra K.), Lees, Martin R., Balakrishnan, G., Liao, D., Keeble, Dean Samuel, Gavilano, J., Egetenmeyer, N., Dewhurst, C. and Paul, Don McK. (2012) First-order reorientation transition of the flux-line lattice in CaAlSi. Physical Review Letters, Vol.108 (No.7). 077001. doi:10.1103/PhysRevLett.108.077001 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.108.077001
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 Hc1 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 γλ=2.7(1), with the field applied perpendicular to the c axis, and agrees with the coherence length anisotropy determined from critical field measurements.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 17 February 2012 | ||||
Dates: |
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Volume: | Vol.108 | ||||
Number: | No.7 | ||||
Page Range: | 077001 | ||||
DOI: | 10.1103/PhysRevLett.108.077001 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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