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Related Experiment Video

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High-Throughput Behavioral Aging and Lifespan Assays Using the Lifespan Machine

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A phenomenological multiband Eliashberg model for LiFeAs.

G A Ummarino¹, Sara Galasso, A Sanna

¹Istituto di Ingegneria e Fisica dei Materiali, Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy. giovanni.ummarino@infm.polito.it

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|April 26, 2013

Summary

The superconductivity of LiFeAs is explained by a four-band theory. This model reproduces experimental data, including critical temperature and magnetic field, using specific coupling strengths.

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Area of Science:

Condensed Matter Physics
Superconductivity Theory

Background:

Iron-based superconductors like LiFeAs exhibit complex superconducting properties.
Understanding the underlying pairing mechanism is crucial for advancing superconductor research.

Purpose of the Study:

To explain the phenomenology of LiFeAs superconductors.
To investigate the role of electron-phonon and spin-fluctuation couplings in superconductivity.

Main Methods:

Utilized a four-band s±-wave Eliashberg theory framework.
Analyzed existing experimental data on critical temperature, gap values, and upper critical magnetic field.
Employed an effective model incorporating intraband and interband spin-fluctuation couplings.

Main Results:

Successfully reproduced experimental critical temperature, gap values, and upper critical magnetic field.
Identified a moderately strong coupling regime essential for explaining LiFeAs superconductivity.
Determined the necessity of both intraband (λ11 ∼ 0.9) and interband spin-fluctuation couplings.

Conclusions:

The four-band s±-wave Eliashberg theory effectively describes LiFeAs superconductivity.
A combination of intraband and interband couplings is required for accurate theoretical reproduction of experimental data.
The non-negligible intraband coupling might arise from violations of Migdal's theorem.