Figure 7.

Upper critical field and Pauli-limited superconductivity

(A) Superconducting phase diagram H(T). Symbols used here denote the temperature-dependent μ₀H_c2 and μ₀H₀ obtained from ρ-T curves, measured at different magnetic fields. The solid (dashed) lines show the fitting results (theoretical curves) obtained from the WHH theory. Adapted from Xiang et al.¹⁵⁶

(B) Superconducting H_c2-T phase diagrams for magnetic fields along the c axis and in the ab plane. The regions above H_c2 (open and filled circles) are shaded orange, representing the normal state, while the regions under H_c2 are shaded as a transition from red regions near T_c to green regions near 0 K, representing a transition from superconductivity limited by orbital de-pairing to Pauli-limited superconductivity. The solid green lines are WHH fits of the H_c2 data above the low-temperature upturn. Adapted from Wang et al.¹⁶⁸