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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.36: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

Transport properties and magnetization of Sr₄Ru₃O₁₀ — •Lara Pätzold¹, Zahra Ghazinezhad¹, Agustinus A. Nugroho², Markus Braden¹, and Thomas Lorenz¹ — ¹II. Physikalisches Institut, Universität zu Köln, Germany — ²Bandung Institute of Technology, Indonesia

The layered transition metal oxide Sr₄Ru₃O₁₀ is a member of the Ruddlesden-Popper series and crystallizes in an orthorhombic structure. It is a ferromagnetic metal with T_c ≈ 105 K and an additional metamagnetic transition at 50 K, where a deeper understanding of the magnetism is still missing. We present a study of single crystals of Sr₄Ru₃O₁₀ in terms of magnetization and electrical transport properties. We measured in-plane and out-of-plane magnetization and also investigated a possible anisotropy in the ab plane. Additionally we measured longitudinal ρ_xx and Hall resistivity ρ_xy with the magnetic field applied in the c direction. We observe a normal and anomalous Hall effect, whereby the latter shows a non-monotonic temperature dependence. In addition, the magnetoresistance changes sign at low temperatures. Analogous behavior of ρ_xx and ρ_xy is seen in the sister compound SrRuO₃, which in addition shows a anomalous spin dynamics [1]. All of these observations are associated to Weyl points in the bandstructure [2].

Funded by the DFG via CRC 1238 Projects A02, B01 and B04

[1] K. Jenni et al., Phys Rev Lett. 123, 017202 (2019)

[2] K. Takiguchi et al., Nat. Commun. 11, 4969 (2020)

Keywords: Transition metal oxides; Ruddlesden-Popper series; anomalous Hall effect; Weyl fermions