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High-sensitivity $^{27}$Al nuclear magnetic resonance (NMR) measurements ofaluminum metal under hydrostatic pressure of up to 10.1 GPa reveal anunexpected negative curvature in the pressure-dependence of the electronicdensity of states measured through shift and relaxation, which violates freeelectron behavior. A careful analysis of the Fermiology of aluminum shows thatpressure induces an electronic topological transition (Lifshitz transition)that is responsible for the measured change in the density of states. Theexperiments also reveal a sudden increase in the NMR linewidth above 4.2 GPafrom quadrupole interaction, which is not in agreement with the metal's cubicsymmetry.

Nuclear magnetic resonance at up to 10.1 Giga-Pascal pressure detects an electronic topological transition in aluminum metal