New transport experiments in strange metals

In diverse correlated electron metals, departures from Landau’s Fermi liquid theory happen down to temperatures much lower than the natural energy scales characterizing the system. Such metals are collectively dubbed `strange metals’ to reflect our lack of a general theoretical understanding. A prominent example is in the normal state of high Tc cuprates near optimal doping. Famously the electrical resistivity is linear in temperature over a wide range of temperature. Suppressing the superconductivity with a magnetic field reveals that the linear resistivity persists down essentially to the zero temperature limit. Similar linear resistivity is seen in a number of different metals.