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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

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Candidate Quantum Spin Liquid in the Ce3+ Pyrochlore Stannate Ce2Sn2O7.

Romain Sibille¹, Elsa Lhotel², Vladimir Pomjakushin³

¹Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.

Physical Review Letters

|September 16, 2015

Summary

This study reveals that the rare-earth pyrochlore, Cerium2Tin2Oxygen7 (Ce2Sn2O7), exhibits an unusual antiferromagnetic liquid ground state. Despite Ising-like magnetic moments, strong quantum fluctuations prevent long-range magnetic ordering at low temperatures.

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Area of Science:

Condensed Matter Physics
Magnetism
Quantum Materials

Background:

Rare-earth pyrochlores are a promising class of materials for exploring novel magnetic phenomena.
Understanding the interplay between crystal electric fields and magnetic interactions is crucial for predicting magnetic ground states.

Purpose of the Study:

To investigate the low-temperature magnetic properties of Cerium2Tin2Oxygen7 (Ce2Sn2O7).
To determine the nature of the magnetic ground state and the role of quantum fluctuations.

Main Methods:

Magnetic susceptibility measurements.
Magnetization measurements at low temperatures (down to 0.02 K).

Main Results:

Ce2Sn2O7 possesses Ising-like magnetic moments (∼1.18 μB) confined to local trigonal axes.
Antiferromagnetic exchange interactions were observed.
Strong antiferromagnetic correlations emerge below 1 K.
No long-range magnetic ordering was detected down to 0.02 K, contrary to classical spin ice predictions.

Conclusions:

Ce2Sn2O7 exhibits an antiferromagnetic liquid ground state.
The ground state is characterized by significant quantum fluctuations.
The material deviates from classical models of Ising spins on a pyrochlore lattice.