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Theories of the strange metal, the parent state of many high temperaturesuperconductors, invariably involve an important role for correlations in thespin and charge degrees of freedom. The most distinctive signature of thisstate in the charge transport sector is a resistance that varies linearly intemperature, but this phenomenon does not clearly point to one mechanism astemperature is a scalar quantity that influences every possible mechanism formomentum relaxation. In a previous work we identified an unusual scalingrelationship between magnetic field and temperature in the in-plane resistivityof the unconventional superconductor BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$, providingan opportunity to use the vector nature of the magnetic field to acquireadditional clues about the mechanisms responsible for scattering in the strangemetal state. Here we extend this work by investigating other components of theconductivity tensor under different orientations of the magnetic field. We findthat the scaling phenomenon involves only the out-of-plane component of themagnetic field and is, strikingly, independent of the direction of the appliedcurrent. This suggests that the origin of the strange magnetotransport is inthe action of the magnetic field on the correlated behavior of spin and chargedegrees of freedom, rather than on the simple cyclotron motion of individualquasiparticles.

Anisotropy in the Magnetoresistance Scaling of BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$