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Hall-plot of the phase diagram for Ba(Fe1-xCox)2As2
Kazumasa Iida1,2, Vadim Grinenko1,2, Fritz Kurth2,3
1Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Scientific Reports
|June 23, 2016
Summary
Investigating strained Ba(Fe1-xCox)2As2 films reveals a universal Hall number plot near antiferromagnetic transitions. This finding links magnetic and superconducting properties in iron-based superconductors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- The Hall effect is crucial for understanding carrier properties in materials.
- Traditional Hall coefficient interpretation fails near quantum phase transitions and for complex systems like iron-based superconductors.
- Strain engineering offers a method to tune material properties and phase diagrams.
Purpose of the Study:
- To investigate the impact of in-plane strain on the Hall effect in Ba(Fe1-xCox)2As2 thin films.
- To explore how strain influences the phase diagram as a function of Cobalt doping.
- To understand the underlying physics governing the Hall coefficient in these multiband superconductors.
Main Methods:
- Fabrication of Ba(Fe1-xCox)2As2 thin films with controlled compressive and tensile in-plane strain.
- Systematic variation of Cobalt (Co) doping levels across the fabricated films.
- Measurement of Hall effect properties as a function of temperature and doping for different strain states.
Main Results:
- In-plane strain shifts the phase diagram of Ba(Fe1-xCox)2As2 with respect to Co doping.
- A universal phase diagram is achieved by plotting data using the Hall number, irrespective of strain state.
- This universality is linked to critical fluctuations near the antiferromagnetic transition in multiband systems.
Conclusions:
- The Hall number provides a universal descriptor for the phase diagram of strained Ba(Fe1-xCox)2As2.
- Critical fluctuations in multiband systems near magnetic transitions play a significant role.
- A direct connection between magnetic and superconducting properties is suggested for the BaFe2As2 system.
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