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Unified Phase Diagram for Iron-Based Superconductors.
Yanhong Gu1,2, Zhaoyu Liu1,2, Tao Xie1,2
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Physical Review Letters
|October 28, 2017
Summary
A unified phase diagram for iron-based superconductors is proposed. This model suggests tuning nematic fluctuations can control magnetic ground states, revealing their strongly correlated nature.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- High-temperature superconductivity often emerges near antiferromagnetic parent compounds.
- Cuprates exhibit a unified phase diagram due to similar parent compounds and carrier doping.
- Iron-based superconductors display diverse parent compounds, challenging unified phase diagram concepts.
Purpose of the Study:
- To investigate the relationship between magnetic order and nematic fluctuations in iron pnictides.
- To establish a unified phase diagram for iron-based superconductors.
- To determine if iron-based superconductors are strongly correlated electron systems.
Main Methods:
- Analysis of ordered moments in various iron pnictides.
- Measurement of effective Curie constants for nematic susceptibility.
- Correlation analysis between magnetic properties and nematic fluctuations.
Main Results:
- A direct inverse proportionality was found between ordered moments and effective Curie constants of nematic susceptibility.
- This scaling behavior indicates magnetic ground states are tunable via nematic fluctuations.
- A hypothetical parent compound with large ordered moment and weak nematic fluctuations is proposed.
Conclusions:
- A unified phase diagram for iron-based superconductors can be established.
- Iron-based superconductors are strongly correlated electron systems.
- Tuning nematic fluctuations is key to understanding superconductivity in these materials.
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