  Theories of the strange metal, the parent state of many high temperature
superconductors, invariably involve an important role for correlations in the
spin and charge degrees of freedom. The most distinctive signature of this
state in the charge transport sector is a resistance that varies linearly in
temperature, but this phenomenon does not clearly point to one mechanism as
temperature is a scalar quantity that influences every possible mechanism for
momentum relaxation. In a previous work we identified an unusual scaling
relationship between magnetic field and temperature in the in-plane resistivity
of the unconventional superconductor BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$, providing
an opportunity to use the vector nature of the magnetic field to acquire
additional clues about the mechanisms responsible for scattering in the strange
metal state. Here we extend this work by investigating other components of the
conductivity tensor under different orientations of the magnetic field. We find
that the scaling phenomenon involves only the out-of-plane component of the
magnetic field and is, strikingly, independent of the direction of the applied
current. This suggests that the origin of the strange magnetotransport is in
the action of the magnetic field on the correlated behavior of spin and charge
degrees of freedom, rather than on the simple cyclotron motion of individual
quasiparticles.
