QCN members E. Kiritsis and Li Li, has used holographic techniques to model and study the competition of four phases: an antiferromagnetic phase, a superconducting phase, a metallic phase and a striped phase, using as control parameters temperature and a doping-like parameter. This is motivated by the need to understand the phase diagram of strange metals. As strong coupling is important, holographic techniques are appropriate. They analyse the various instabilities and determine the possible phases. One class of phase diagrams, that are analyse in detail, is similar to that of high-temperature superconductors as well as other strange metal materials.