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The quasiparticle density of states in a two-dimensional d-wavesuperconductor depends on the orientation of the in-plane external magneticfield H. This is because. in the region of the gap nodes, the Doppler shift dueto the circulating supercurrents around a vortex depend on the direction of H.For a tetragonal system the induced pattern is four-fold symmetric and, at zeroenergy, the density of states exhibits minima along the node directions. ButYBa_2C_3O_{6.95} is orthorhombic because of the chains and the pattern becomestwo-fold symmetric with the position of the minima occuring when H is orientedalong the Fermi velocity at a node on the Fermi surface. The effect of impurityscattering in the Born and unitary limit is discussed.Comment: 24 pages, 11 Figure

Magnetic-field effects on the density of states of orthorhombic superconductors