title: Nuclear magnetic resonance at up to 10.1 GPa pressure detects an electronic topological transition in aluminum metal.
abstract: High-sensitivity (27)Al nuclear magnetic resonance (NMR) measurements of aluminum metal under hydrostatic pressure of up to 10.1 GPa reveal an unexpected negative curvature in the pressure dependence of the electronic density of states measured through shift and relaxation, which violates free electron behavior. A careful analysis of the Fermiology of aluminum shows that pressure induces an electronic topological transition (Lifshitz transition) that is responsible for the measured change in the density of states. The experiments also reveal a sudden increase in the NMR linewidth above 4.2 GPa from quadrupole interaction, which is not in agreement with the metal's cubic symmetry.
authors.affiliation: Faculty of Physics and Earth Sciences, University of Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Meissner
authors.forename: Swee K
authors.initials: SK
authors.lastname: Goh
authors.forename: Jürgen
authors.initials: J
authors.lastname: Haase
authors.forename: Manuel
authors.initials: M
authors.lastname: Richter
authors.forename: Klaus
authors.initials: K
authors.lastname: Koepernik
authors.forename: Helmut
authors.initials: H
authors.lastname: Eschrig
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D004579:Electron Transport; D004581:Electronics; D004583:Electrons; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D044367:Phase Transition; D011312:Pressure
chemical_list: D000535:Aluminum