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Mooij Law Violation from Nanoscale Disorder
Aifeng Wang1, Lijun Wu1, Qianheng Du1,2
1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States.
Nano Letters
|August 17, 2022
Summary
Sulfur substitution in iron selenide superconductors creates disorder, suppressing superconductivity and leading to unusual high-temperature metallic resistivity. This reveals a novel scattering mechanism beyond conventional theories.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Nanoscale inhomogeneity significantly influences the properties of 2D van der Waals materials.
- Understanding these effects is crucial for designing novel electronic and superconducting devices.
Purpose of the Study:
- To investigate the impact of sulfur substitution on the structural and electronic properties of Fe1-xSe1-ySy.
- To elucidate the relationship between nanoscale disorder and unconventional scattering mechanisms in these materials.
Main Methods:
- Synthesis of Fe1-xSe1-ySy with varying sulfur content (0 ≤ x ≤ 1, y ≤ 0.1).
- Characterization of structural properties, including bond lengths and disorder.
- Electrical resistivity measurements as a function of temperature and magnetic field.
Main Results:
- Sulfur substitution induces Fe-Ch bond length differences and strong atomic disorder for 0.4 ≤ x ≤ 0.8.
- Superconducting transition temperature (Tc) is suppressed, and disorder-related scattering is enhanced.
- High-temperature metallic resistivity exceeds the Mott limit, violating Matthiessen's rule and Mooij law.
Conclusions:
- Unconventional scattering mechanism, unrelated to phonons, arises from strong Se/S disorder around Fe atoms.
- Findings highlight the intricate link between nanostructural disorder and emergent electronic properties.
- Potential connection to charge-nematic or magnetic spin fluctuations is suggested.
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