The magnetic, thermal transport properties, magnetothermal effect and critical behavior of Co3Sn2S2 single crystal.

Through the magnetic/thermal transport measurements combined with the analyses of magnetocaloric effect and critical behavior of Co3Sn2S2 single crystal, the main results we obtained are as follows: in the case of the magnetic field H//c‐axis, Co3Sn2S2 exhibits the phase‐separation state below Tc in the low‐field region (H < 500 Oe). Tc increases slightly from 174 to 177 K with an increase in H from 100 to 10 kOe. The second‐order magnetic phase transition near Tc and the itinerant ferromagnetism below Tc are identified. The magnetization below Tc matches well with the three‐dimensional Ising model, instead of the mean‐field model. In the case of H//ab, Tc changes between 175 and 178 K with varying H. Noticeably, M above Tc exhibits a small positive value, instead of the null M as commonly expected in the paramagnetic region. An extra phase transition below 166 K is observed. The magnetic transition near Tc seems not to be the second‐order phase transition. All results show a significant characteristic of anisotropic magnetic phase transition for the Co3Sn2S2 single crystal. They support mutually those in previous reports, moreover, some new phenomena are also observed. They also provide the experimental evidences for the deep insight into the magnetic phase–transition behavior of Co3Sn2S2. [ABSTRACT FROM AUTHOR]