Nonlinear emergent elasticity and structural transitions of skyrmion crystal under uniaxial distortion
arXiv:1812.06311 · doi:10.1103/PhysRevB.99.214412
Abstract
Emergent crystals are periodic alignment of "emergent particles", i.e., localized collective behavior of atoms or their charges/spins/orbits. These novel states of matter, widely observed in various systems, may deform under mechanical forces with elasticity strikingly different from that of the underlying material. However, their nonlinear and critical behaviors under strong fields are hitherto unclear. Here we theoretically study the nonlinear elasticity and structural transitions of skyrmion crystals (SkX) suffering uniaxial distortion by using three different methods. Under moderate tension, SkX behaves like a ductile material, with a negative crossover elastic stiffness and a negative emergent Poisson's ratio at appropriate conditions of magnetic field. Under strong straining, we observe at most six phase transitions, leading to appearance of four novel emergent crystals that are thermodynamically metastable. When subject to external loads, emergent crystals rotate globally, and their composing "particles" have unlimited deformability, which render their exotic polymorphism.
arXiv comment10 pages, 4 Figures
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Cited by in corpus (4)
- Tensile deformations of the magnetic chiral soliton lattice probed by Lorentz transmission electron microscopy
- Enhanced skyrmion metastability under applied strain in FeGe
- Long-wavelength emergent phonons in skyrmion crystals distorted by exchange anisotropy and tilted magnetic fields
- Topological transition and emergent elasticity of dislocation in skyrmion lattice: Beyond Kittel's magnetic-polar analogy