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TT: Fachverband Tiefe Temperaturen

TT 9: Poster Session: Correlated Electrons

TT 9.11: Poster

Dienstag, 28. September 2021, 13:30–16:00, P

Emergence of a fluctuating magnetic ground state in Mn_1−xFe_xSi — Andreas Bauer¹, Jonas Kindervater¹, •Johanna K. Jochum², Wolfgang Häussler^{1, 2}, Nicolas Martin³, Markus Garst⁴, and Christian Pfleiderer¹ — ¹Physik Department, Technische Universität München, D-85748 Garching, Germany — ²Heinz Maier-Leibnitz Zentrum, Technische Universität München, D85748 Garching, Germany — ³Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin, 91191 Gif-sur-Yvette, France — ⁴Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany

Substitutional doping of the cubic chiral magnet MnSi results in a suppression of magnetic order and quantum critical behavior that is masked by the influence of disorder. Combining measurements of the ac susceptibility and specific heat with elastic neutron scattering and neutron resonance spin-echo spectroscopy on single-crystal Mn_1−xFe_xSi in zero magnetic field, we show that up to x=0.10 static helimagnetic order emerges through a Brazovskii-type fluctuation-induced first-order phasetransition. For x=0.12, the signatures in the susceptibility are reminiscent of helimagnetic order, while the specific heat indicates the absence of a first-order transition and neutron spectroscopy unambiguously establishes the dynamic character down to temperatures of 50 mK, suggesting a magnetic ground state that is dominated by interacting chiral fluctuations.