Nanopaleomagnetic properties of the meteorite cloudy zone

Joshua F. Einsle, Alexander S. Eggeman, Benjamin H. Martineau, Zineb Saghi, Sean M. Collins, Roberts Blukis, Paul A. J. Bagot, Paul A. Midgley, Richard J. Harrison

Research output: Contribution to journalArticlepeer-review


We combine an analytically solvable mean-field elasto-plastic model with molecular dynamics simulations of a generic glass-former to demonstrate that, depending on their preparation protocol, amorphous materials can yield in two qualitatively distinct ways. We show that well-annealed systems yield in a discontinuous brittle way, as metallic and molecular glasses do. Yielding corresponds in this case to a first-order nonequilibrium phase transition. As the degree of annealing decreases, the first-order character becomes weaker and the transition terminates in a second-order critical point in the universality class of an Ising model in a random field. For even more poorly annealed systems, yielding becomes a smooth crossover, representative of the ductile rheological behavior generically observed in foams, emulsions, and colloidal glasses. Our results show that the variety of yielding behavior found in amorphous materials does not result from the diversity of particle interactions or microscopic dynamics {\it per se}, but is instead unified by carefully considering the role of the initial stability of the system.
Original languageEnglish
Pages (from-to) E11436-E11445
JournalProceedings of the National Academy of Sciences
Issue number49
Publication statusPublished - 16 Nov 2018


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