  A search for scalar top quarks in R-parity violating supersymmetry is
performed in e^+ p collisions at HERA using the H1 detector. The data, taken at
sqrt{s}=319 GeV and 301 GeV, correspond to an integrated luminosity of 106
pb^-1. The resonant production of scalar top quarks \tilde{t} in positron quark
fusion via an R-parity violating Yukawa coupling lambda' is considered with the
subsequent bosonic stop decay \tilde{t} -> \tilde{b} W. The R-parity violating
decay of the sbottom quark tilde{b} -> d \bar{nu_e} and leptonic and hadronic W
decays are considered. No evidence for stop production is found in the search
for bosonic stop decays nor in a search for the direct R-parity violating decay
\tilde{t} -> eq. Mass dependent limits on lambda' are obtained in the framework
of the Minimal Supersymmetric Standard Model. Stop quarks with masses up to 275
GeV can be excluded at the 95% confidence level for a Yukawa coupling of
electromagnetic strength.
