Effect of magnetic field on over-doped HTc superconductors: Conflicting predictions of various HTc theories

TL;DR

This paper examines how magnetic fields influence over-doped high-temperature superconductors, highlighting conflicting predictions from various theories and proposing that a spin pseudo-gap may appear in magnetic fields.

Contribution

It compares different HTc theories' predictions on magnetic field effects in over-doped cuprates and suggests a new testable phenomenon involving the spin pseudo-gap.

Findings

Different theories predict varying effects of magnetic fields on T_c and T^* in over-doped cuprates.

A spin pseudo-gap may be observed in magnetic fields in over-doped samples.

Theoretical predictions are inconsistent across models.

Abstract

Following the recent NMR experiments by Gorny et al., we discuss the effect of a magnetic field on the superconducting T_c and the spin pseudo-gap T^*. As a testable prediction, we argue that a spin pseudo-gap should also be observed in over-doped samples in a magnetic fied (while normally there is no pseudo-gap above T_c). We find that different theoretical approaches have marked differences in their predictions for over-doped HTc cuprates.