  Cr0.68Se single crystals with two-dimensional (2D) character have been grown,
and the detailed magnetization M(T), electrical transport properties (including
longitudinal resistivity and Hall resistivity and thermal transport ones
(including heat capacity Cp(T) and thermoelectric power (TEP) S(T)) have been
measured. There are some interesting phenomena: (i) Cr0.68Se presents a
non-collinear antiferromagnetic (AFM) semiconducting behavior with the Neel
temperature TN = 42 K and the activated energy Eg=3.9 meV; (ii) It exhibits the
anomalous Hall effect (AHE) below TN and large negative magnetoresistance (MR)
about 83.7% (2 K, 8.5 T). The AHE coefficient RS is 0.385 cm-3/C at T=2 K and
the AHE conductivity {\sigma}H is about 1 ohm-1cm-1 at T=40 K, respectively;
(iii) The scaling behavior between the anomalous Hall resistivity and the
longitudinal resistivity is linear and further analysis implies that the origin
of the AHE in Cr0.68Se is dominated by the skew-scattering mechanism. Our
results may be helpful for exploring the potential application of these kind of
2D AFM semiconductors.
