  We have characterized spin-squeezed states produced at a temperature of
$26^\circ{\mathrm C}$ on a Nuclear Magnetic Resonance (NMR) quadrupolar system.
The implementation is carried out in an ensemble of $^{133}$Cs nuclei with spin
$I=7/2$ of a lyotropic liquid crystal sample. We identify the source of spin
squeezing due to the interaction between the quadrupole moment of the nuclei
and the electric field gradients internally present in the molecules. We use
the spin angular momentum representation to describe formally the nonlinear
operators that produce the spin squeezing. The quantitative and qualitatively
characterization of the spin squeezing phenomena is performed through a
squeezing parameter and squeezing angle developed for the two-mode BEC system,
and, as well, by the Wigner quasi-probability distribution function. The
generality of the present experimental scheme indicates its potential
applications on solid state physics.
