2011/12/30 by Pabitra Kumar Biswas⃰, P. K. Biswas, M. R. Lees +9
Materials Science · Physics and Astronomy · #Anisotropy #Antiferromagnetism #Coherence length #Condensed matter physics #Critical field #Geometry #Hexagonal lattice #Iron-based superconductors research #Lattice (music) #Neutron scattering #Optics #Penetration depth #Perpendicular #Physics #Rare-earth and actinide compounds #Scattering #Superconductivity #Superconductivity in MgB2 and Alloys #Vortex #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.108.077001
published as Physical Review Letters 108, 077001 (2012) · 5 pages including 6 figures, to appear in Physical Review Letters
arxiv created 2011/12/30 · openalex publication_date 2012/02/13 · arxiv updated 2012/02/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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\ifmmode^∘\else\textdegree\fi 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 \ensuremathλ=1496(1) \AA and a single coherence length of \ensuremathξ=307(1) \AA at 2 K. At 1.5 K, the penetration depth anisotropy is \ensuremathγ_\ensuremathλ=2.7(1), with the field applied perpendicular to the c axis, and agrees with the coherence length anisotropy determined from critical field measurements.