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Related Experiment Video

Updated: Jan 29, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Electrical resistivity across a nematic quantum critical point.

S Licciardello¹, J Buhot¹, J Lu¹

¹High Field Magnet Laboratory (HFML-EMFL) and Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands.

|February 15, 2019

Summary

Researchers studied electronic nematicity in iron chalcogenides, observing quantum critical behavior. High magnetic fields revealed T-linear resistivity, suggesting nematic fluctuations influence strange metal properties.

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Area of Science:

Condensed Matter Physics
Quantum Materials Science

Background:

Correlated electron systems exhibit electronic order, with quantum criticality observed near absolute zero.
Electronic nematicity, a state of broken rotational symmetry, is often intertwined with other orders like antiferromagnetism or charge-density waves.
The iron chalcogenide FeSe$_{1-x}$S$_{x}$ presents a unique system where nematic order appears isolated, but its impact on the electronic ground state was previously obscured by superconductivity.

Purpose of the Study:

To investigate the electronic nematic quantum critical point in FeSe$_{1-x}$S$_{x}$ by suppressing superconductivity.
To elucidate the role of nematicity in the electronic transport properties of quantum critical materials.
To explore the connection between nematic fluctuations and the behavior of 'strange metals'.

Main Methods:

Utilized high magnetic fields to suppress the superconducting state in FeSe$_{1-x}$S$_{x}$.
Measured the electrical resistivity evolution across the nematic quantum critical point.
Analyzed temperature dependence of resistivity to identify quantum critical signatures.

Main Results:

Observed classic signatures of quantum criticality, including enhanced T$^{2}$ resistivity (electron-electron scattering) approaching the critical point.
Revealed strictly T-linear resistivity at the nematic critical point, extending over a wide temperature range.
Demonstrated the phenomenon of nematic quantum criticality in an isolated nematic system.

Conclusions:

Nematic quantum criticality was clearly identified in FeSe$_{1-x}$S$_{x}$ under high magnetic fields.
The observed T-linear resistivity at the nematic critical point suggests a significant role for nematic fluctuations in the transport properties of strange metals.
This study provides crucial insights into the fundamental physics of correlated electron systems and quantum criticality.