Fig. 2: Lower and upper critical fields.
From: Spin-triplet superconductivity in Weyl nodal-line semimetals
a–c The lower critical fields Hc1 as a function of temperature for LaNiSi (a), LaPtSi (b), and LaPtGe (c). For each temperature, Hc1 was determined as the value where the field-dependent magnetization M(H) starts to deviate from linearity (see Supplementary Fig. 3 and Note 3). Solid lines are fits to \({\mu }_{0}{H}_{{{{\rm{c1}}}}}(T)={\mu }_{0}{H}_{{{{\rm{c1}}}}}(0)[1-{(T/{T}_{{{{\rm{c}}}}})}^{2}]\). d–f Upper critical fields Hc2 versus the reduced temperature T/Tc for LaNiSi (d), LaPtSi (e), and LaPtGe (f). The superconducting transition temperatures Tc were determined from heat-capacity- C(T) and magnetization measurements M(H) (see details in Supplementary Figs. 4–6 and Note 4). For LaPtSi and LaPtGe, two different sample batches (denoted as S1 and S2) were measured. The dash-dotted-lines, dashed-lines, and solid-lines are fits using WHH-, GL-, and two-band models, respectively. The Hc2 values determined from ρ(T,H) from ref. 5 are also plotted in e for LaPtSi. The error bars of Hc1 are the field-step values used during the M(H) measurements.
