  A search for stop production in R-parity-violating supersymmetry has been
performed in $e^{+}p$ interactions with the ZEUS detector at HERA, using an
integrated luminosity of 65 pb$^{-1}$. At HERA, the R-parity-violating coupling
$\lambda'$ allows resonant squark production, $e^+d\to\tilde{q}$. Since the
lowest-mass squark state in most supersymmetry models is the light stop,
$\tilde{t}$, this search concentrated on production of $\tilde{t}$, followed
either by a direct R-parity-violating decay, or by the gauge decay to
$b\tilde{\chi}^+_{1}$. No evidence for stop production was found and limits
were set on $\lambda'_{131}$ as a function of the stop mass in the framework of
the Minimal Supersymmetric Standard Model. The results have also been
interpreted in terms of constraints on the parameters of the minimal
Supergravity model.
