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High-T c superconductivity in undoped ThFeAsN.
T Shiroka1,2, T Shang3,4,5, C Wang6
1Laboratorium für Festkörperphysik, ETH Hönggerberg, Zürich, CH-8093, Switzerland. tshiroka@phys.ethz.ch.
Nature Communications
|August 2, 2017
Summary
The iron-based superconductor ThFeAsN shows high critical temperature without doping. Strong magnetic fluctuations, not magnetic order, are observed, suggesting structural distortions are key to superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Iron-based superconductors are a significant area of research.
- The ReFeAsO series is widely studied, but ThFeAsN presents unique properties.
- Understanding factors beyond doping that induce superconductivity is crucial.
Purpose of the Study:
- To investigate the magnetic and superconducting properties of ThFeAsN.
- To compare ThFeAsN with the ReFeAsO series.
- To explore the role of structural distortions and correlation effects in superconductivity.
Main Methods:
- Muon-spin rotation/relaxation (μSR) techniques.
- Nuclear magnetic resonance (NMR) spectroscopy.
- Detailed investigation of magnetic and superconducting properties.
Main Results:
- ThFeAsN exhibits a critical temperature of 30 K without doping or pressure.
- Strong magnetic fluctuations were observed, suppressed below 35 K, but no magnetic order.
- This contrasts with ReFeAsO, where parent materials order antiferromagnetically.
Conclusions:
- Fermi-surface modifications via structural distortions and correlation effects are vital for inducing superconductivity.
- The interplay between antiferromagnetism and superconductivity in undoped ThFeAsN suggests deviations from standard models.
- ThFeAsN offers a new platform for studying superconductivity mechanisms in iron-based materials.
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