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Bannenberg, L.J. (author), Sadykov, R. (author), Dalgliesh, R. M. (author), Goodway, C. (author), Schlagel, D. L. (author), Lograsso, T. A. (author), Falus, P. (author), Lelièvre-Berna, E. (author), Pappas, C. (author)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...journal article 2019
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Sadykov, Ravil (author), Pappas, C. (author), Bannenberg, L.J. (author), Dalgliesh, Robert M. (author), Falus, Péter (author), Goodway, Christopher (author), Lelièvre-Berna, Eddy (author)We have developed and realised a compact high-pressure clamp cell of the piston-cylinder type for Small Angle Neutron Scattering (SANS) and Neutron Spin Echo (NSE) spectroscopy measurements. The cell can pressurise φ5 mm samples up to 1.5 GPa. It is non-magnetic, produces a sufficiently low and flat SANS background with a relatively good...journal article 2018
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Pappas, C. (author), Bannenberg, L.J. (author), Lelièvre-Berna, E. (author), Qian, F. (author), Dewhurst, C. D. (author), Dalgliesh, R. M. (author), Schlagel, D. L. (author), Lograsso, T. A. (author), Falus, P (author)The reference chiral helimagnet MnSi is the first system where Skyrmion lattice correlations have been reported. At a zero magnetic field the transition at TC to the helimagnetic state is of first order. Above TC, in a region dominated by precursor phenomena, neutron scattering shows the buildup of strong chiral fluctuating correlations over...journal article 2017
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Bannenberg, L.J. (author), Kakurai, K. (author), Qian, F. (author), Lelièvre-Berna, E. (author), Dewhurst, C. D. (author), Onose, Y. (author), Endoh, Y. (author), Tokura, Y (author), Pappas, C. (author)Small angle neutron scattering measurements on a bulk single crystal of the doped chiral magnet Fe1-xCoxSi with x=0.3 reveal a pronounced effect of the magnetic history and cooling rates on the magnetic phase diagram. The extracted phase diagrams are qualitatively different for zero and field cooling and reveal a metastable skyrmion lattice...journal article 2016
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Pappas, C. (author), Lelièvre-Berna, E. (author), Bentley, P. (author), Falus, P. (author), Fouquet, P. (author), Farago, B. (author)We present a comprehensive analysis of high-resolution neutron scattering data involving neutron spin echo spectroscopy and spherical polarimetry, which confirm the first-order nature of the helical transition in MnSi. The experiments reveal the existence of a totally chiral dynamic phase in a very narrow temperature range above TC. This...journal article 2011
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Pappas, C. (author), Lelièvre-Berna, E. (author), Falus, P. (author), Bentley, P.M. (author), Moskvin, E. (author), Grigoriev, S. (author), Fouquet, P. (author), Farago, B. (author)We present a comprehensive study of chiral fluctuations in the reference helimagnet MnSi by polarized neutron scattering and neutron spin echo spectroscopy, which reveals the existence of a completely left-handed and dynamically disordered phase. This phase may be identified as a spontaneous Skyrmion phase: it appears in a limited temperature...journal article 2009