Magnetic phase diagram and magneto-elastic coupling of NiTiO3

Abstract

We report high-resolution dilatometry on high-quality single crystals of NiTiO3 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=15T and magnetization studies in static (15T) and pulsed (60T) magnetic fields. Our data allow to quantitatively study magneto-elastic coupling and to determine uniaxial pressure dependencies. While the entropy changes are found to be of magnetic nature, Grüneisen analysis implies only one relevant energy scale in the whole low-temperature regime. Thereby, our data suggest that the observed structural changes due to magneto-elastic coupling and previously reported magnetodielectric coupling[1] are driven by the same $magnetic$ degrees of freedom that lead to long-range magnetic order in NiTiO3, which in turn, establishes a linear magnetodielectric coupling in this compound.

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Cited by in corpus (5)

• Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO${}_3$
• Electronic and magnetic properties of iridium ilmenites $A$IrO${}_3$ ($A=$ Mg, Zn, and Mn)
• Magneto-structural coupling in ilmenite-type NiTiO${}_3$: a combined diffraction and dilatometry study
• The role of magnetoelastic coupling and magnetic anisotropy in MnTiO${}_3$
• Dirac Magnon in Honeycomb Lattice Magnet NiTiO3