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Related Experiment Video

Updated: Sep 1, 2025

A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics

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Published on: August 28, 2018

Mooij Law Violation from Nanoscale Disorder.

Aifeng Wang¹, Lijun Wu¹, Qianheng Du^1,2

¹Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, United States.

|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.

Keywords:

defects disorder electrical transport superconductivity

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Published on: June 2, 2017

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 Fe_1-xSe_1-yS_y.
To elucidate the relationship between nanoscale disorder and unconventional scattering mechanisms in these materials.

Main Methods:

Synthesis of Fe_1-xSe_1-yS_y 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 (T_c) 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.