Fig. 4: Magnetization curves for the superconducting phase of La-doped CaFe2As2.
From: Manipulating superconducting phases via current-driven magnetic states in rare-earth-doped CaFe2As2
Ms − H loops when pure SC phases are considered for a LaCa122-A and b LaCa122-B, respectively, where Ms is the magnetization of the pure SC phase. Because the M − H loops at 2 and 50 K are superimposed as the FM background, as shown in Fig. 3c, d, the Ms – H loops can simply be calculated by using the relation Ms(2 K, H) = M(2 K, H) – M(50 K, H). The temperature dependence of the magnetization (M – T) for c LaCa122-A and d LaCa122-B shows that the SC volume fraction barely changes with current and time. Zero-field cooling starts from zero gauss at 2 K for both samples, with the negligible M values at zero gauss (remanent fields) for all cases, indicating that the M – T results are acceptable
