Possible scale invariant linear magnetoresistance in pyrochlore iridates Bi 2 Ir 2 O 7

We report the observation of a linear magnetoresistance in single crystals and epitaxial thin films of the pyrochlore iridate Bi 2 Ir 2 O 7 . The linear magnetoresistance is positive and isotropic at low temperatures, without any sign of saturation up to 35 T. As temperature increases, the linear field dependence gradually evolves to a quadratic field dependence. The temperature and field dependence of magnetoresistance of Bi 2 Ir 2 O 7 bears strikingly resemblance to the scale invariant magnetoresistance observed in the strange metal phase in high T c cuprates. However, the residual resistivity of Bi 2 Ir 2 O 7 is more than two orders of magnitude higher than the curpates. Our results suggest that the correlation between linear magnetoresistance and quantum fluctuations may exist beyond high temperature superconductors.