title: Critical field enhancement near a superconductor-insulator transition.
abstract: We have discovered a phenomenon where the orbital pair breaking effect is reduced, if not eliminated. It appears as a striking enhancement in the upper critical field H(c2) for (TMTSF)2PF6 and a strong upward curvature in the critical field versus temperature in the region of pressure-temperature phase space near the superconductor-spin density wave insulator boundary. A simple model based on self-consistently dividing the superconductor into layers explains the observations remarkably well and provides a unique way around orbital frustration and toward higher critical fields.
authors: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA. ijlee@princeton.edu
authors: I J
authors: IJ
authors: Lee
authors: P M
authors: PM
authors: Chaikin
authors: M J
authors: MJ
authors: Naughton