Is time-reversal breaking in Sr2RuO4 an intrinsic bulk property

Determine whether the time-reversal symmetry breaking seen by zero-field muSR and polar Kerr rotation below $T_c$ in Sr2RuO4 is a bulk property of the superconducting order parameter or is tied to dislocations and local strain. An answer compares muSR and Kerr signal size across samples with measured defect density, and tests whether the signal onset follows $T_c$ under stress and disorder.

Systematic muSR and Kerr studies on samples with controlled dislocation density showing whether the signal scales with volume or with defects.