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Role played by electrons in the stress-strain curves of ideal crystalline solids

Margherita Marsili*, Elisa Damiani, Davide Dalle Ave, Gabriele Losi, and M. Clelia Righi†

  • Department of Physics and Astronomy, University of Bologna, Viale Carlo Berti Pichat 6/2, 40127 Bologna, Italy

  • *Contact author: margherita.marsili@unibo.it
  • †Contact author: clelia.righi@unibo.it
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Phys. Rev. B 113, 184111 – Published 7 May, 2026

DOI: https://doi.org/10.1103/nb45-7js6

Abstract

The mechanical properties of a solid, which relate its deformation to external applied forces, are key factors in enabling or disabling the use of an otherwise optimal material in any application, strongly influencing also its service lifetime. Intrinsic crystal deformation mechanisms, investigated experimentally on single crystals with low dislocation densities, have been studied theoretically through atomistic simulations, mainly focusing on lattice-induced instabilities. Here, instead, we employ density functional theory and a thermodynamic analysis to probe and analyze the way in which the electronic charge of crystalline solids (Cu, Al and diamond) respond to uniaxial strain and affects their mechanical properties. Indeed, despite the very simple nature of our models, and in the presence of minimal atomic displacements, we find that the stress strain curves of Cu and Al deviate from a simple linear elastic behavior. Within a thermodynamics perspective, the features of such curves can be interpreted in terms of first- and second-order phase transitions, which originate from Van Hove singularities of the electronic density of states crossing the Fermi level and electron redistribution within the solid.

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Phys. Rev. B 113, 184111– Published 7 May, 2026
  • Received 4 August 2025
  • Revised 2 March 2026
  • Accepted 7 April 2026
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