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Progress in Cr- and Mn-based superconductors: a key issues review.

R Y Chen¹, N L Wang^2,3

¹Center for Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)

|December 8, 2018

Summary

Magnetic fluctuations, once thought to harm superconductivity, are now key to novel superconductors like CrAs and MnP. New Cr-based compounds also show superconductivity near magnetic instability.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

Historically, magnetic ions were considered detrimental to superconductivity.
Unconventional superconductivity is now induced in magnetic systems (heavy fermion, cuprate, iron-based) where magnetic fluctuations may mediate Cooper pairing.
The discovery of superconductivity in CrAs and MnP under pressure expanded this field.

Purpose of the Study:

To review the physical properties of novel magnetic superconductors.
To discuss recent research on the interplay between magnetism and superconductivity in these materials.

Main Methods:

Review of existing literature and experimental data.
Analysis of physical properties of CrAs, MnP, and related Cr-based compounds.

Main Results:

CrAs and MnP are the first Cr- and Mn-based superconductors, with Cr/Mn 3d electrons dominating Fermi level states.
New ambient-pressure Cr-based quasi-one-dimensional superconductors (A2Cr3As3 and ACr3As3) were discovered.
Superconductivity in these systems exists close to magnetic instability.

Conclusions:

Magnetic fluctuations are crucial for Cooper pairing in these novel superconductors.
These materials offer new platforms for studying the interplay of magnetism and superconductivity.