The precursor state to superconductivity in CeIrIn${_5}$: Unusual   scaling of magnetotransport
  We present an analysis of the normal-state Hall effect and magnetoresistance in the heavy fermion superconductor CeIrIn${_5}$. It is demonstrated that the modified Kohler's scaling--which relates the magnetoresistance to the Hall angle--breaks down prior to the onset of superconductivity due to the presence of a precursor state to superconductivity in this system. A model-independent, single-parameter scaling of the Hall angle governed solely by this precursor state is observed. Neither the Hall coefficient nor the resistivity exhibit this scaling implying that this precursor state preferentially influences the Hall channel. 
Sunil Nair, M. Nicklas, F. Steglich, J.L. Sarrao, J.D. Thompson, A.J.   Schofield and S. Wirth