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8–10 Dec 2020 Online only
Online event
Europe/Berlin timezone

Critical magnetic fluctuations in Ca2RuO4 studied by neutron spin-echo and triple-axis spectroscopy

10 Dec 2020, 14:00
15m
Online event

Online event

Talk DN: Magnetism DN2020: Magnetism

Speaker

Heiko Trepka (MPI for Solid State Research, Stuttgart)

Description

We report on comprehensive high-resolution linewidth measurements of critical antiferromagnetic fluctuations in Ca2RuO4 (CRO214) performed at the neutron resonance spin-echo spectrometer TRISP at FRM II and the cold triple-axis spectrometer FLEXX at BER II. CRO214 is structurally related to the unconventional superconductor Sr2RuO4 [1] and hosts a complex interplay between magnetic and electronic correlations leading to a novel type of soft-magnetism with strong single-ion anisotropy, and ‘Higgs’ amplitude fluctuations in the spin-wave spectrum, as revealed by recent neutron experiments [2].
In contrast to conventional magnetic phase transitions, the magnetic ordering in CRO214 below TN ~ 110 K emerges from exciton condensation [3]. Therefore, since the magnetic fluctuations in proximity to TN are fundamentally related to the nature of the magnetic correlations in the system, our study can shed new light on the exceptional ‘excitonic’ magnetism in CRO214.

[1] Nat. 372, 532, (1994).
[2] Nat. Phys. 13, 633, (2017).
[3] Phys. Rev. Lett. 111, 197201, (2013).

Primary author

Heiko Trepka (MPI for Solid State Research, Stuttgart)

Co-authors

Thomas Keller (MPI for Solid State Research, Stuttgart) Matthias Hepting (Max Planck Institute for Solid State Physics) Dr Maximilian Krautloher (Max-Planck-Institut für Festkörperforschung) Jianhui Xu (MLZ, TUM) Klaus Habicht (Helmholtz-zentrum Berlin für Materialien und Energie) Prof. Bernhard Keimer (Max-Planck-Institut für Festkörperforschung) Dr Juan Porras (Max-Planck-Institut für Festkörperforschung)

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