Magnetic-field effects in the pseudogap phase: A competing energy gap scenario for precursor superconductivity - art. no. 140505

We study the sensitivity of T-c and the pseudogap onset temperature, T*, to low fields, H, using a BCS-based approach extended to arbitrary coupling. We find that T* and T-c which are of the same superconducting origin, have very different H dependences. This is due to the pseudogap, Delta (pg), whi ch is present at the latter, but not former temperature. Our results for th e coherence length xi fit well with existing experiments. We predict that v ery near the insulator xi will rapidly increase.