Figure 5: Angular magnetoresistance oscillations for a PdCoO₂ single crystal.

(a) Interplanar magnetoresistivity ρ_c for a PdCoO₂ single crystal as a function of the angle θ between the [001] interplanar direction and the external field μ₀H. The pronounced peaks observed as a function of θ are the so-called Yamaji-effect peaks²². (b) Interlayer coherence peak observed for fields nearly along the interplanar direction, which indicates an extended FS along the interlayer direction²⁴. From the width Δθ of the peak at half maximum, one can estimate the value of the interlayer transfer integral t_c=2.79 meV from equation (1). (c) Interplanar resistivity ρ_c as a function of μ₀H at T=1.8 K and for two angles, that is, the Yamaji value θ_n=1=23.0° and θ=22.7°. It is noteworthy how the pronounced positive magnetoresistivity observed at θ_n=1 is strongly suppressed when μ₀H is rotated by just ∼0.3°, leading to magnetoresistance saturation. (d) ρ_c as a function of μ₀H under T=1.8 K and for θ=21.5°. It is noteworthy how ρ_c, after increasing by several orders of magnitude, displays negative magnetoresistivity at higher fields, thus indicating a clear competition between the orbital and another mechanism, which suppresses the magnetoresistivity. Dotted red line corresponds to a fit of .