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Far-infrared resonance in Sr(2)RuO(4).

M G Hildebrand¹, M Reedyk, T Katsufuji

¹Department of Physics, Brock University, St. Catharines, Ontario, Canada L2S 3A1.

Physical Review Letters

|December 12, 2001

Summary

The study reveals that below 2.5 K, strontium ruthenate (Sr2RuO4) exhibits a plasma edge linked to coherent carrier motion. This indicates a loss of scattering, enabling superconductivity, with a resonance near 9 meV disrupting coherence.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

Strontium ruthenate (Sr2RuO4) is a superconductor with potential technological applications.
Understanding the electronic properties and scattering mechanisms is crucial for elucidating its superconducting behavior.

Purpose of the Study:

To investigate the optical conductivity and electronic scattering in Sr2RuO4 near its superconducting transition.
To identify the role of electronic correlations and scattering in the emergence of superconductivity.

Main Methods:

Far-infrared c-axis reflectance measurements were performed on Sr2RuO4.
Measurements were conducted at temperatures above and below the superconducting transition temperature (2.5 K).
Analysis of optical conductivity and frequency-dependent scattering rates was performed.

Main Results:

A plasma edge emerged near 70 cm(-1) below the superconducting transition temperature.
This plasma edge corresponds to a Drude peak in optical conductivity, signifying coherent carrier motion.
A gap-like suppression of the scattering rate below 60 cm(-1) was observed at low temperatures.
A strong resonance near 9 meV was identified as the cause of scattering that disrupts coherence.

Conclusions:

The development of coherent carrier motion is directly linked to the superconducting transition in Sr2RuO4.
The loss of scattering below 60 cm(-1) at low temperatures is a key factor enabling superconductivity.
A specific resonance at 9 meV plays a critical role in limiting the coherence length and potentially influencing the superconducting mechanism.

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