Scaling Behavior of Angular Dependent Resistivity in CeCoIn$_5$:   Possible Evidence for d-Wave Density Waves
  In-plane angular dependent resistivity ADR was measured in the non-Fermi liquid regime of CeCoIn$_5$ single crystals at temperatures $T \le 20$ K and in magnetic fields $H$ up to 14 T. Two scaling behaviors were identified in low field region where resistivity shows T-linear dependence, separated by a critical angle $\theta_{c}$ which is determined by the anisotropy of CeCoIn$_5$; i.e., ADR depends only on the perpendicular (parallel) field component below (above) $\theta_c$. These scaling behaviors and other salient features of ADR are consistent with d-wave density waves. 
T. Hu, H. Xiao, T. A. Sayles, M. B. Maple, Kazumi Maki, B. Dora and C.   C. Almasan