  A new technique has been used to search for solar axions using a single
crystal germanium detector. It exploits the coherent conversion of axions into
photons when their angle of incidence satisfies a Bragg condition with a
crystalline plane. The analysis of approximately 1.94 kg.yr of data from the
1-kg DEMOS detector in Sierra Grande, Argentina, yields a new laboratory bound
on axion-photon coupling of g_{a,\gamma\gamma}<2.7\times 10^{-9} GeV^{-1}
independent of axion mass up to \sim 1 keV.

Astrophysics