Giant Nernst Effect and Lock-In Currents at Magic Angles in [Formula presented]

We have measured the thermoelectric signal along the [Formula presented] axis in [Formula presented] at 10 kbar as a function of the orientation of the applied magnetic field. Resonantlike Nernst signals were found with a dramatic sign change as the field was rotated through the “Lebed magic angles.” The sign change indicates that the electrical current is “locked in” to the magic angle (interchain) directions for field alignment close to, but on either side of, the magic angles. The amplitude of signals near these angles is many orders of magnitude larger than expected from conventional Boltzmann transport theory.