Extended Data Fig. 4: Comparison of ODMR splitting and Bz on field cooling S2 at Hz = 79 G.
From: Imaging the Meissner effect in hydride superconductors using quantum sensors
Measurements of four point electrical resistance and the ODMR splitting, Δ, at four spatial locations [shown in maintext Fig. 4(b)]: (a,b) two points on top the synthesized CeH9 (blue and orange), (c) one point at the edge of this region (green), and (d) one point away from region (yellow). (a,b) On top of the CeH9 region, we measure a decrease in Δ ≈ (2π) × 15 MHz as we cool below the transition point. (c) In contrast, at the edge of this region, we measure an increase in Δ ≈ (2π) × 15 MHz. (d) Away from the CeH9 region we do not measure an appreciable change in Δ across the transition point (determined via simultaneous electrical resistance measurements). (e,f,g,h) For the Δ values measured at each spatial point, we extract the magnetic field, Bz, based on the 2Π⊥ stress splitting (measured at the same spatial point at Hz = 0 G after zero field cooling to T = 86 K). Systematic disagreement between Bz and Hz for T > Tc may stem from inaccurate determination of 2Π⊥ or change in the value of 2Π⊥ with temperature.
