|Title||Signatures of quantum criticality in pure Cr at high pressure|
|Publication Type||Journal Article|
|Year of Publication||2010|
|Authors||Jaramillo, R, Feng, Y, Wang, J, Rosenbaum, TF|
|Journal||Proceedings of the National Academy of Sciences|
|Pagination||13631 - 13635|
|Keywords||Antiferromagnetism, Cr, Electronic Transport, Pressure, Quantum Criticality, Quantum Phase Transitions, Spin Density Waves|
The elemental antiferromagnet Cr at high pressure presents a new type of naked quantum critical point that is free of disorder and symmetry-breaking fields. Here we measure magnetotransport in fine detail around the critical pressure, Pc ∼ 10 GPa, in a diamond anvil cell and reveal the role of quantum critical fluctuations at the phase transition. As the magnetism disappears and T → 0, the magntotransport scaling converges to a non-mean-field form that illustrates the reconstruction of the magnetic Fermi surface, and is distinct from the critical scaling measured in chemically disordered Cr∶V under pressure. The breakdown of itinerant antiferromagnetism only comes clearly into view in the clean limit, establishing disorder as a relevant variable at a quantum phase transition.