Crystal growth, resistivity and Hall effect of the delafossite metal   PtCoO$_2$
  We report single crystal growth of the delafossite oxide PtCoO$_2$, and basic transport measurements on single crystals etched to well-defined geometries using focused ion beam techniques. The room temperature resistivity is 2.1 $\mu\Omega$ cm, and the Hall coefficient is consistent with the existence of one free electron per Pt. Although the residual resistivity ratio is greater than fifty, a slight upturn of resistivity is seen below 15 K. The angle dependence of the in-plane magnetoresistance is also reported. 
Pallavi Kushwaha, Philip J. W. Moll, Nabhanila Nandi, and Andrew P.   Mackenzie
cond-mat.str-el cond-mat.mtrl-sci