Bend conductance of crossed wires in the presence of Andreev scattering
  We study the 4-probe bend conductance $G_{14,32}$ of a mesoscopic crossed wire structure in the ballistic regime in the absence of a magnetic field, which for normal devices is usually negative. We predict that for sufficiently large devices and for small applied voltages $G_{14,32}$ becomes positive in the presence of Andreev scattering, but at large voltages $G_{14,32}$ remains negative. 
Simon Robinson