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An antiferromagnetic (AFM) ground state and a possible high-field ordered state in magnetic fields $Hg1\text{ }\text{T}$ of a filled-skutterudite compound ${\text{CeOs}}_{4}{\text{Sb}}_{12}$ were investigated by the muon spin rotation and relaxation method. In a zero applied field, a spontaneous local field due to the weak AFM ordering was observed below $\ensuremath{\sim}1.6\text{ }\text{K}$. The magnetic volume fraction gradually increases below 1.6 K with decreasing temperature, suggesting that this phase is sensitive to sample quality. The magnitude of the ordered dipole moment in the AFM state was estimated to be in the range of $0.11--0.17\text{ }{\ensuremath{\mu}}_{B}/\text{Ce}$ at 0.1 K. In a field of 2 T applied along the [001] direction, clear anomalies in the muon Knight shift and linewidth were observed at $\ensuremath{\sim}1.5\text{ }\text{K}$, consistent with the phase-transition scenario into the high-field ordered state suggested from specific-heat, resistivity, elastic, and NMR anomalies. The possibility of multipole ordering in the high-field phase was discussed.

physical review b

Microscopic study of antiferromagnetic ground state and possible high-field ordered state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>CeOs</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Sb</mml:mtext></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>using muon spin rotation and relaxation

Microscopic study of antiferromagnetic ground state and possible high-field ordered state inCeOs4Sb12using muon spin rotation and relaxation