  Temperature-linear resistance at low temperatures in strange metals is an
exotic characteristic of strong correlation systems, as observed in high-TC
superconducting cuprates, heavy fermions, Fe-based superconductors, ruthenates,
and twisted bilayer graphene. Here, we introduce a hole-doped valley-spin
insulator, V-doped WSe2, with hole pockets in the valence band. The strange
metal characteristic was observed in VxW1-xSe2 at a critical carrier
concentration of 9.5 x 10^20 cm-3 from 150 K to 1.8 K. The unsaturated
magnetoresistance is almost linearly proportional to the magnetic field. Using
the ansatz R(H,T) - R(0,0) ~ [(alpha.k.T)^2+(gamma.mu.B)^2]^1/2, the
gamma/alpha ratio is estimated approximately to 4, distinct from that for the
quasiparticles of LSCO, BaFe2(As1-xPx)2 (gamma/alpha=1) and bosons of YBCO
(gamma/alpha=2). Our observation opens up the possible routes that induce
strong correlation and superconductivity in two-dimensional materials with
strong spin-orbit coupling.
