Dec 7 – 8, 2021 Online only
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Critical fluctuations in the layered ruthenates Ca2RuO4 and Ca3Ru2O7

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Dec 7, 2021, 9:55 AM
Talk Quantum Phenomena Quantum Phenomena


Heiko Trepka


Materials realizing the scaling behavior of the XY model in two dimensions (2D) are sparse. Here we report on comprehensive neutron triple-axis measurements conducted at the FRM2, BER2, and ILL to investigate the critical static and dynamical magnetic fluctuations in the layered ruthenates Ca$_{2}$RuO$_{4}$ (CRO214) and Ca$_{3}$Ru$_2$O$_{7}$ (CRO327). Specifically, we probe the temperature-dependence of the antiferromagnetic (AFM) Bragg-intensity, the $Q$-width, the amplitude, and the energy-width of the magnetic diffuse scattering in vicinity to the Neel temperature $T_N$ to determine the critical behaviour of the magnetic order parameter $M$, correlation length $\xi$, susceptibility $\chi$, and the characteristic energy $\Gamma$. We find that - in spite of distinct magnetic structures - the critical behaviours of CRO214 and CRO327 follow similar universal scaling laws that are compatible with predictions of the 2D-XY model. Hence, our results suggest that single- and bilayer ruthenates provide new platforms to study the 2D-XY model in solid-state materials.

Primary authors

Heiko Trepka Thomas Keller (MPI for Solid State Research, Stuttgart) Maximilian Krautloher (Max Planck Institute for Solid State Research) Klaus Habicht (Helmholtz-zentrum Berlin für Materialien und Energie) Jianhui Xu (Helmholtz-Zentrum Berlin for Materials and Energy) Martin Boehm (Institut Laue-Langevin) Bernhard Keimer (Max Planck Institute for Solid State Research) Matthias Hepting (Max Planck Institute for Solid State Physics)

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