Dresden 2020 – wissenschaftliches Programm
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TT 47.4: Poster
Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG
Thermal expansion and magnetostriction studies on CoTiO3 — •Marco Hoffmann1, Kaustav Dey1, Sven Spachmann1, Rabindranath Bag2, Surjeet Singh2, and Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg, Germany — 2IISER Pune, Maharashtra, India
The S = 3/2 compound CoTiO3 crystallizes in the ilmenite-type structure which belongs to the R-3 space group. In particular, it features a strong magnetoelectric coupling. Recent discovery of Dirac magnons  in this compound motivates further research on the interplay of electronic, magnetic and structural degrees of freedom. We have grown high-quality single crystals by means of the optical floating-zone method and have studied magnetisation, magnetostriction, thermal expansion and specific heat of CoTiO3. Pronounced anomalies in the thermal expansion coefficients at the phase transitions evidence strong magnetoelastic coupling. The magnetic phase diagram evidences a spin-reoriented phase at low magnetic fields indicating small anisotropy within the ab-plane. Grüneisen scaling reveals the relevant energy scales of the ordering phenomena and the structural changes at the phase boundaries are discussed.
 Bo Yuan et al., arXiv:cond-mat/1907.02061v1