LAUSR

Some intricate behaviors have been reported at magnetic compensation temperature in ${\mathrm{Co}}_{2}{\mathrm{TiO}}_{4}$ (CTO), but their origins are still unclear. In this paper, we investigate systematically the anomalous properties in CTO crystal by using direct and alternating current magnetic susceptibilities, specific heat, thermal expansion, magnetostriction, and neutron diffraction measurements. CTO exhibits a ferrimagnetic ordering transition at ${T}_{C}\ensuremath{\approx}48\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ and a magnetic compensation behavior at ${T}_{\mathrm{comp}}\ensuremath{\approx}31\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Under zero field, there is no obvious anomaly in CTO around ferrimagnetic compensation temperature ${T}_{\mathrm{comp}}$, but a minimum value of M(T), a drop of ${\ensuremath{\chi}}^{\ensuremath{'}}(T)$, a step of $\mathrm{\ensuremath{\Delta}}L/{L}_{80\phantom{\rule{0.16em}{0ex}}\mathrm{K}}$ and a sharp specific heat peak all occur at ${T}_{\mathrm{comp}}$ under the same critical magnetic field of 20 kOe. We propose a phenomenological model to explain these anomalous phenomena, in which the 180 \ifmmode^\circ\else\textdegree\fi{} reversal of the ferrimagnetic component at ${T}_{\mathrm{comp}}$ under $H\ensuremath{\ge}20\phantom{\rule{0.16em}{0ex}}\mathrm{kOe}$, as well as the deflection of the oblique spin moments at B sites under magnetic field, play a key role in how to understand them.