Pressure-Induced Quantum Criticality in Cr

Diamond anvil cell high-pressure techniques are used in concert with high resolution magnetic x-ray diffraction to probe the quantum critical regime of the elemental itinerant antiferromagnet Chromium. The antiferromagnetic order is suppressed by an applied pressure of $\sim $6 GPa in the zero-temperature limit. We perform high-resolution measurements of both the charge- and spin-density-wave order parameters as the system is tuned through this magnetic phase transition. The results illustrate the effects of quantum fluctuations and enhanced dimensionality on a canonical correlated electron system.