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Related Experiment Video

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Published on: June 7, 2018

Direct evidence for a dynamical ground state in the highly frustrated Tb(2)Sn(2)O(7) pyrochlore.

F Bert¹, P Mendels, A Olariu

¹Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, 91405 Orsay, France.

Physical Review Letters

|October 10, 2006

Summary

Muon spin relaxation (mSR) experiments reveal persistent spin fluctuations in ordered spin ice Tb(2)Sn(2)O(7) below its ferromagnetic transition. These dynamics suggest correlated spin clusters maintain the ordered spin ice structure.

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Area of Science:

Condensed Matter Physics
Magnetism
Materials Science

Background:

Ordered spin ice materials like Tb(2)Sn(2)O(7) pyrochlores exhibit complex magnetic behaviors.
Understanding magnetic dynamics in these materials is crucial for their potential applications.

Purpose of the Study:

To investigate the magnetic dynamics of Tb(2)Sn(2)O(7) below its ferromagnetic transition temperature.
To elucidate the nature of spin fluctuations and ordering in this ordered spin ice system.

Main Methods:

Muon spin relaxation (mSR) experiments were conducted on a powder sample of Tb(2)Sn(2)O(7).
Measurements were performed at a base temperature of 35 mK and in the presence of an external magnetic field.

Main Results:

Muon relaxation was found to be dynamical even at 35 mK, indicating persistent spin fluctuations below T(C) = 0.87 K.
Oscillations in muon polarization under an applied field and hysteretic behavior below T(C) suggest hints of long-range ordering.
The observed dynamics are attributed to fluctuations within clusters of correlated spins possessing the ordered spin ice structure.

Conclusions:

Strong spin fluctuations persist in Tb(2)Sn(2)O(7) below the ferromagnetic transition, challenging simple ordering models.
The dynamics are likely governed by fluctuating clusters of spins, maintaining aspects of the ordered spin ice state.
mSR is a sensitive probe for uncovering subtle magnetic dynamics in frustrated magnetic systems.