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00925njm 22002777a 4500 dc Baity Jesi, Marco author Martín Mayor, Víctor author Parisi, G. author Pérez Gaviro, S. author 2015-12-23 In the three-dimensional Heisenberg spin glass in a random field, we study the properties of the inherent structures that are obtained by an instantaneous cooling from infinite temperature. For a not too large field the density of states g(ω) develops localized soft plastic modes and reaches zero as ω^4 (for large fields a gap appears). When we perturb the system adding a force along the softest mode, one reaches very similar minima of the energy, separated by small barriers, that appear to be good candidates for classical two-level systems. 0031-9007 10.1103/PhysRevLett.115.267205 https://hdl.handle.net/20.500.14352/24341 http://dx.doi.org/10.1103/PhysRevLett.115.267205 http://journals.aps.org Soft Modes, Localization, and Two-Level Systems in Spin Glasses