Fig. 2: Magnetoresistance of FeP at high field.

The transverse MR Δρ/ρ, defined as \(\frac{\rho ({\bf{B}})-\rho (0\,{\rm{T}})}{\rho (0\,{\rm{T}})}\), measured up to high magnetic fields oriented at several angles for FeP crystals a S1 (RRR ≈ 1300) and b S2 (RRR ≈ 1400), whose orientations are noted. Note that S1 was actually aligned with two different reflections of the [101] family, but the angle has been shifted to ease readability. The temperature was held constant at 400 ± 50 mK for all measurements. MR is larger for S2 at the common B ∥ a-axis orientation, which can be linked to its higher RRR value. c The B ∥ c-axis data for S1, with a linear fit (pink) made over the entire field range. The graphics above the curve show an image of the unit cell highlighting the octahedral Fe–P coordination, and axes that indicate the alignment of the crystal picture (generated with VESTA⁵⁹) and how field was rotated for S1 and S2 (current was always perpendicular to field). The inset below the curve is a closeup of the data below 1 T.