Spin density of states of proximity effect superconducting sandwiches in high fields

We use a tunneling Hamiltonian model to study the behavior of a thin film superconducting-normal metal sandwich in a parallel magnetic field including the effects of Pauli spin paramagnetism. The field acts to spin-split the density of states of the superconductor and the normal metal. With increasing magnetic field the sandwich displays zero temperature electron spin paramagnetism and a first-order transition to the normal state. We present a calculation of the field dependence of the density of states and order parameter.