Shining light on quantum magnetism under pressure

Simon Bettler
Laboratorium f. Festkörperphysik, ETH Zürich
Wednesday, September 19, 2018
11:00 am
RH 310M
One of the focuses of modern experimental solid state physics is studying quantum critical phenomena. Recently, pressure-induced quantum phase transitions in spin systems have attracted a lot of attention due to the possibility of observing universality classes which are fundamentally different from the usual field-induced transitions. On an experimental level however, studying magnetic excitations under pressure is notoriously difficult. This is due to the limitations in sample volume and bulky pressure cells producing weak signals on top of an often large background. I will make a case for Raman spectroscopy as a complementary technique to study spin dynamics under pressure. Still in its infancy, we already see benefits of these efforts in studying both pressure-induced ordering in the quantum paramagnets PHCC well as investigating the excitations of the Shastry-Sutherland model compound SrCu2(BO3)2.
Sasha Chernyshev