SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Frustrated Magnets I
MA 33.7: Vortrag
Mittwoch, 29. März 2023, 16:45–17:00, HSZ 403
Magneto-elastic coupling and new phases in the Shastry-Sutherland compound NdB4 discovered by high-resolution dilatometry — •Rahel Ohlendorf1, Sven Spachmann1, Lukas Fischer1, Daniel Brunt2, Jasper Linnartz3, Steffen Wiedmann3, Geetha Balakrishnan2, Oleg Petrenko2, and Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg, Germany — 2Department of Physics, University of Warwick, Coventry, UK — 3HFML Nijmegen, Netherlands
We report high-resolution dilatometry studies on single crystals of the Shastry-Sutherland-lattice magnet NdB4 supported by specific heat and magnetometry data. The evolution of magnetically ordered phases below TN = 17.2 K (commensurate antiferromagnetic phase), TIT = 6.8 K (intermediate incommensurate phase), and TLT = 4.8 K (low-temperature phase) is associated with pronounced anomalies in the thermal expansion coefficients. The data imply significant magneto-elastic coupling and evidence of a structural phase transition at TLT. Grüneisen analysis of the ratio of thermal expansion coefficient and specific heat enables the derivation of uniaxial as well as hydrostatic pressure dependencies. From the observed anomalies the magnetic phase diagrams for B∥c up to 15 T and for B∥[110] up to 35 T are constructed. New in-field phases are discovered for both field directions and already known phases are confirmed. In particular, phase boundaries are unambiguously shown by sign changes of observed anomalies and corresponding changes in uniaxial pressure effects.