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Iron pnictides as a new setting for quantum criticality
Jianhui Dai1, Qimiao Si, Jian-Xin Zhu
1Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou 310027, China.
Summary
We reveal a unique magnetic quantum critical point in iron pnictides, driven by competing electronic localization and itinerancy. This finding explains variations in magnetic moments and suggests P substitution for accessing this quantum criticality.
Area of Science:
- Condensed matter physics
- Quantum critical phenomena
- Unconventional superconductivity
Background:
- Quantum criticality and unconventional superconductivity are key themes in strongly correlated electron systems.
- Iron pnictides exhibit moderately high-temperature superconductivity and antiferromagnetic ordering, prompting investigation into magnetic quantum criticality.
Purpose of the Study:
- To investigate the nature of magnetic quantum criticality in undoped iron pnictides.
- To understand the role of competing electronic localization and itinerancy in these phenomena.
- To provide a theoretical framework for observed variations in magnetic moments.
Main Methods:
- Theoretical modeling of electronic interactions in iron pnictides.
- Analysis of the competition between electronic localization and itinerancy.
- Proposing P substitution as a method to study magnetic quantum criticality.
Main Results:
- Identified a unique type of magnetic quantum critical point in undoped iron pnictides.
- Developed a theory explaining the variation of ordered magnetic moments.
- Demonstrated that competition between localization and itinerancy drives this quantum criticality.
Conclusions:
- Iron pnictides host a distinct magnetic quantum critical point.
- The findings offer a mechanism for understanding magnetic moment variations.
- Suggests P substitution as a route to experimentally probe this quantum criticality in iron pnictides.
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