Skyrmions and spirals in MnSi under hydrostatic pressure

Abstract

The archetype cubic chiral magnet MnSi is home to some of the most fascinating states in condensed matter such as skyrmions and a non-Fermi liquid behavior in conjunction with a topological Hall effect under hydrostatic pressure. Using small angle neutron scattering, we study the evolution of the helimagnetic, conical and skyrmionic correlations with increasing hydrostatic pressure. We show that the helical propagation vector smoothly reorients from $⟨111⟩$ to $⟨100⟩$ at intermediate pressures. At higher pressures, above the critical pressure, the long-range helimagnetic order disappears at zero magnetic field. Nevertheless, skyrmion lattices and conical spirals form under magnetic fields, in a part of the phase diagram where a topological Hall effect and a non-Fermi liquid behavior have been reported. These unexpected results shed light on the puzzling behavior of MnSi at high pressures and the mechanisms that destabilize the helimagnetic long-range order at the critical pressure.

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• Spontaneous Skyrmion Ground States in Magnetic Metals
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• Unusual Hall Effect Anomaly in MnSi Under Pressure
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Cited by in corpus (7)

• Evolution of magneto-crystalline anisotropies in Mn${}_{1-x}$Fe${}_x$Si and Mn${}_{1-x}$Co${}_x$Si as inferred from small-angle neutron scattering and bulk properties
• Dual nature of magnetism in MnSi
• Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet
• Experimental Evidence of a change of Exchange Anisotropy Sign with Temperature in Zn-Substituted Cu2OSeO3
• Evolution of Helimagnetic Correlations when approaching the Quantum Critical Point of Mn${}_{1-x}$Fe${}_x$Si
• Pressure induced isostructural phase transition in biskyrmion host hexagonal MnNiGa
• Origin of the suppression of magnetic order in MnSi under hydrostatic pressure