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Synopsis

In this work, transverse-field (TF) muon spin rotation (渭SR) technique was employed to determine the in-plane magnetic penetration depth 位ac in high-quality LaNiGa2 single crystals. The temperature dependence of the superfluid density inferred from measurements of 位ac(T) is well described by a two-band model with strong interband coupling, supporting a proposed internally antisymmetric, nonunitary spin-triplet state for this superconductor. This thesis also revisits two TF-渭SR studies of Sr2RuO4 that show different behaviors for the limiting low-T temperature dependence of the in-plane magnetic penetration depth 位aband hence reach different conclusions regarding the superconducting gap structure. Here it is shown through the application of a common data analysis method that both studies are consistent with a low-temperature 位ab 鈭� T2 dependence, and are in agreement with Meissner-state measurements of 螖位ab(T) = 位ab(T) 鈭� 位ab(0) obtained by other techniques. In addition, the magnetic field profile B(r) in Sr2RuO4 is shown to be abnormal, introducing a new constraint on the possible superconducting order parameters of Sr2RuO4.

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