Year: 2020
Type: article
Abstract: We report high-resolution dilatometry on high-quality single crystals of ${\mathrm{NiTiO}}_{3}$ grown by means of the optical floating-zone technique. The anisotropic magnetic phase diagram is constructed from thermal expansion and magnetostriction studies up to $B=15\phantom{\rule{0.16em}{0ex}}\mathrm{T}$ and magnetization studies in static (15-T) and pulsed (60-T) magnetic fields. Our data allow us to quantitatively study magnetoelastic coupling and to determine uniaxial pressure dependencies. While the entropy changes are found to be of magnetic nature, Gr\"uneisen analysis implies only one relevant energy scale in the whole low-temperature regime. Thereby, our data suggest that the observed structural changes due to magnetoelastic coupling and previously reported magnetodielectric coupling [L. Balhorn, J. Hazi, M. C. Kemei, and R. Seshadri, Phys. Rev. B 93, 104404 (2016)] are driven by the same $magnetic$ degrees of freedom that lead to long-range magnetic order in ${\mathrm{NiTiO}}_{3}$.
Language: Latvian
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3005759650