Orientational field-dependence of low-lying excitations in mixed state of unconventional superconductors

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Orientational field-dependence of the zero energy density of states (ZEDOS) is calculated for superconductors with the polar state (line node), axial state (point node) and 3D d-wave state. Depending on the gap topology and relative field direction the field dependencies of ZEDOS sensitively differ, providing us a useful and practical method to identify the gap topology. It is also demonstrated that for d-wave state the field rotation in the basal plane shows a sizable oscillation 3% of ZEDOS. This is directly measurable in low-T specific heat experiment in the mixed state.