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Dynamic properties of a diluted pyrochlore cooperative paramagnet (Tb(p)Y(1-p))2Ti2O7.

A Keren¹, J S Gardner, G Ehlers

¹Department of Physics, Technion-Israel Institute of Technology, Haifa 32000, Israel.

Physical Review Letters

|April 20, 2004

Summary

Paramagnetic fluctuations persist in frustrated pyrochlores down to absolute zero, even with dilution. This cooperative spin motion is sensitive to magnetic coverage but not critical at the percolation threshold.

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Area of Science:

Condensed Matter Physics
Magnetism
Materials Science

Background:

Geometrically frustrated pyrochlores exhibit complex magnetic behaviors.
Understanding spin dynamics in diluted magnetic systems is crucial.

Purpose of the Study:

Investigate spin dynamics in (Tb(p)Y(1-p))2Ti2O7 pyrochlores.
Determine the effect of magnetic dilution on spin fluctuations.

Main Methods:

Muon spin relaxation (μSR)
Neutron spin echo (NSE)
Varying magnetic coverage (p)

Main Results:

Paramagnetic fluctuations prevail as temperature approaches absolute zero (T→0) for all dilution levels.
Spin fluctuations are sensitive to dilution, indicating cooperative spin motion.

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The percolation threshold (pc) does not represent a critical point for these fluctuations.

Low-temperature spectral density exhibits 1/f behavior.

Dilution leads to a slowdown in spin fluctuation dynamics.

Conclusions:

Geometrical frustration in pyrochlores leads to persistent paramagnetic fluctuations.
Dilution influences spin dynamics, suggesting cooperative behavior without a critical percolation point.
The observed 1/f noise and slowed dynamics provide insights into disordered magnetic systems.