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Hidden fermi surface nesting and charge density wave instability in low-dimensional metals.

M H Whangbo, E Canadell, P Foury

Science (New York, N.Y.)

|April 5, 1991

Summary

Hidden Fermi surface nesting explains charge density wave instabilities in low-dimensional metals. Studies on purple bronze AMo(6)O(17) confirm this concept using diffuse x-ray scattering, revealing crucial electronic instability mechanisms.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

Low-dimensional metals with partially filled bands often show charge density wave (CDW) instabilities.
Observed CDW instabilities sometimes lack clear nesting vectors on individual Fermi surfaces.

Purpose of the Study:

To explore the concept of hidden Fermi surface nesting.
To investigate the role of hidden nesting in CDW instabilities in AMo(6)O(17).

Main Methods:

Theoretical concept of hidden Fermi surface nesting.
Experimental diffuse x-ray scattering to observe CDW spatial fluctuations.
Analysis of Fermi surfaces in purple bronze AMo(6)O(17) (A = Na, K).

Main Results:

Diffuse x-ray scattering experiments confirmed CDW spatial fluctuations.
These fluctuations align with predictions from hidden Fermi surface nesting in AMo(6)O(17).
The study provides experimental evidence supporting the hidden nesting concept.

Conclusions:

Hidden Fermi surface nesting is a key factor in understanding electronic instabilities.
This concept is crucial for explaining CDW formation in certain low-dimensional metals.
The findings advance the understanding of electron behavior in complex materials.