Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Frustrated Magnets II

MA 40.3: Talk

Thursday, March 20, 2025, 15:30–15:45, H20

Ultrasound Investigation of the Magnetic Phase Diagram of Rouaite Cu₂(OH)₃NO₃ — •Nikolai Pavlovskii¹, Anton Kulbakov¹, Aswathi M. Chakkingal¹, Justus Grumbach¹, Kaushick K. Parui¹, Ulrike Stockert¹, Maxim Avdeev^2,3, Ramender Kumar⁴, Issei Niwata⁴, Ellen Häussler¹, Roman Gumeniuk⁵, Ross J. Stewart⁶, Vladimir Pomjakushin⁷, Sergey Granovsky¹, Mathias Doerr¹, Elena Hassinger¹, Sergei Zherlitsyn⁸, Andreas Hauspurg⁸, Yoshihiko Ihara⁴, Darren C. Peets¹, and Dmytro Inosov¹ — ¹TU Dresden, Germany — ²ANSTO, Sydney, Australia — ³University of Sydney, Australia — ⁴Hokkaido University, Japan — ⁵TU Bergakademie Freiberg, Germany — ⁶ISIS, United Kingdom — ⁷PSI, Villigen, Switzerland — ⁸HZDR, Dresden, Germany

Rouaite, Cu₂(OH)₃NO₃, is a low-dimensional quantum magnet with alternating ferromagnetic and antiferromagnetic spin chains. Its magnetic phase diagram has been studied using techniques such as magnetization and specific heat, revealing field-induced transitions. This work focuses on ultrasonic investigations, which uncover the coupling between magnetic and elastic properties. New results under hydrostatic pressure further demonstrate the tunability of the magnetic phases, highlighting the material’s sensitivity to lattice modifications.

Keywords: Ultrasound; Cu-based mineral; Rouaite