P-wave Pairing and Colossal Magnetoresistance in Manganese Oxides

TL;DR

This paper suggests that manganese oxides exhibit frustrated p-wave superconductivity in their ferromagnetic phase, which explains their colossal magnetoresistance and other properties, hinting at potential room temperature superconductivity.

Contribution

It introduces the idea that frustrated p-wave pairing accounts for the observed phenomena in manganese oxides, linking superconductivity to CMR.

Findings

Superconducting coherence is limited, resembling superfluid He-3 A1 state.

Colossal magnetoresistance is explained by superconducting fluctuations.

Finite resistivity may result from magnetic inhomogeneities.

Abstract

We point out that the existing experimental data of most manganese oxides show the {\sl frustrated} p-wave superconducting condensation in the ferromagnetic phase in the sense that the superconducting coherence is not long enough to cover the whole system. The superconducting state is similar to the $A_{1}$ state in superfluid He-3. The sharp drop of resistivity, the steep jump of specific heat, and the gap opening in tunneling are well understood in terms of the p-wave pairing. In addition, colossal magnetoresistance (CMR) is naturally explained by the superconducting fluctuations with increasing magnetic fields. The finite resistivity may be due to some magnetic inhomogeneities. This study leads to the possibility of room temperature superconductivity.