Probe of superconductor fluctuations by a tunneling junction in a magnetic field

We consider a tunnel junction with one side superconducting and the other side slightly above the superconducting transition temperature. The fluctuation-induced current in the presence of a magnetic field is calculated starting from the single-particle tunneling Hamiltonian. Our treatment takes into account nonuniform fluctuations across the normal film and for strong magnetic field deviation from the previously obtained $H^2$ dependence is predicted. It is also verified that the field has the effect of both suppressing the transition temperature and picking out a particular momentum component of the order-parameter correlation function.