Probing the angular dependence of the vortex lattice in a Nickel-chalcogenide superconductor
We intend to measure the angular dependence of the vortex lattice (VL) of the Nickel-chalcogenide superconductor, TlNi2Se2 using small-angle neutron scattering (SANS) at 0.1K for fields from 0.1T to 0.6T at varying angles up to 45 degrees. This material displays heavy-fermion behaviour and has a two-gap structure. Previous measurements have shown a sharp decline in the form factor if the VL above 0.2T, however more data is required in order to map the gap structure while the c-axis is parallel to the applied field. Previous characterisation of the sample has shown an anisotropy between the c-axis and a-b plane resistivity, with the anisotropy at rho_c/rho_ab = 1.57 at 300K, rising to rho_c/rho_ab > 3 at 4.0K, just above T_c = 3.7K. The same resistivity data also appears to show the resistivity for the c-axis fall more sharply at the superconducting transition point as well as transitioning at a higher temperature than the a-b plane resistivity. We intend to rotate the c-axis away from parallel with the field and measure the form factor and the relative angle between the two VL domains observed in previous measurements.
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JELLYMAN Erik; BLACKBURN Elizabeth; CUBITT Robert; FORGAN Edward M.; Alexander T Holmes; JEFFERIES Philippa; POLLARD Stephen and RIYAT Randeep. (2016). Probing the angular dependence of the vortex lattice in a Nickel-chalcogenide superconductor. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-417
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