Latent Superconductivity in doped manganites

TL;DR

This paper predicts a latent high-temperature d-wave spin triplet superconductivity in doped manganites, explained by orbital degrees of freedom, and accounts for various experimental anomalies.

Contribution

It introduces the concept of latent orbital-driven superconductivity in doped manganites, providing a theoretical framework for observed low-temperature anomalies.

Findings

Prediction of latent d-wave spin triplet superconductivity

Explanation of pseudogaps and proximity effects in manganites

Identification of orbital degrees of freedom enabling superconductivity

Abstract

We analyze effective Hamiltonian of ferromagnetic half metal phase of doped manganites and find a latent d-wave spin triplet superconductivity. Spin triplet state for a d-wave pair is enabled by orbital degrees of freedom. This high Tc superconductivity is, however, kept dormant by some intrinsic strong cooper pair breaking processes. Low T anomalies such as i) long distance superconducting proximity effects into manganites, ii) pseudogaps in tunneling, ARPES and iii) nodal quasi particles and absence of bilayer splitting in ARPES in bilayer manganite get natural and qualitative explanation. Some consequences of our orbital pairing superconductivity are pointed out.