Angular dependence of upper critical field for the two-band superconductor Lu_2Fe_3Si_5

摘要

Based on the two-band GinzburgLandau theory, we study the angular dependence of the upper critical field for the superconducting crystal Lu _2Fe_3Si_5. When θ=0 and θ=π/2, the theoretical results are in good agreement with the experimental data. Hence, the results support the existence of two-gap superconductivity in Lu _2Fe_3Si_5, previously suggested from experiments.