Skyrmions and spirals in MnSi under hydrostatic pressure
Lars Johannes Bannenberg (TU Delft - RST/Neutron and Positron Methods in Materials)
R. Sadykov (Russian Academy of Sciences, National University of Science and Technology MISiS)
Robert Dalgliesh (Rutherford Appleton Laboratory)
C. Goodway (Rutherford Appleton Laboratory)
D. L. Schlagel (Iowa State University)
T. A. Lograsso (Iowa State University)
Péter Falus (Institut Laue Langevin)
E. Lelièvre-Berna (Institut Laue Langevin)
C Pappas (TU Delft - RST/Neutron and Positron Methods in Materials)
G.B. More authors (External organisation)
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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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