SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster Magnetism II
MA 40.19: Poster
Donnerstag, 30. März 2023, 14:00–16:00, P2/EG
Impact of Currents on SDW Order in Sr2RuO4 — •Felix Wirth, Thomas Lorenz, and Markus Braden — II. Physikalisches Institut, Köln, Germany
Unconventional superconductivity and magnetic correlations are expected to be closely coupled in Sr2RuO4. Ca- and Ti-doped Sr2RuO4 exhibit incommensurate (IC) spin density wave (SDW) order below about 20 K appearing at the same wave vector where IC antiferromagnetic spin fluctuations exist in the pure compound. A recent attempt to explain the magnetic order induced by Ti-doping, proposed a potential enhancement of the SDW order by applying an external charge current[1]. To prove this idea Sr2RuO4 single crystals doped with 25 % Ca or with 9 % Ti were grown by the optical floating zone technique. The crystal quality was greatly improved during the iterative process of crystal growth. For the investigations of the impact of currents on the SDW order, the MPMS SQUID magnetometer was adapted. No influence of currents on the SDW state was observed that could not be attributed to sample heating issues. Recorded I-U characteristics did not reveal correlations between the SDW and the electronic properties of the system. Thermal expansion shows significant differences for both cases. The thermal expansion of the Ca-doped crystal qualitatively agrees with results for higher Ca concentrations but does not indicate connections to the SDW state. A negative thermal expansion at low temperatures in the Ti-doped crystal may point to a weak correlation to the SDW state but it also resembles the behaviour in pure Sr2RuO4. [1]B. Zinkl, et al. Phys. Rev. Res. 3 (2021).