Magnetic ordering of Ce in the heavy-fermion compound Ce3Al

W. H. Li, J. C. Peng, Y. C. Lin, K. C. Lee, J. W. Lynn, Y. Y. Chen

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Abstract

Neutron diffraction and specific heat measurements have been performed to study the magnetic ordering of the Ce ions in the heavy-fermion compound Ce 3Al. Detailed crystal structure analysis, determined using high resolution neutron diffraction patterns and Rietveld method, shows that the Ce ions may be grouped into two types: one in the Ce-Al chain, the other in the Ce-Ce chain. The specific-heat data reveal an anomaly at T≈2.2 K, but the calculated magnetic entropy is much smaller than the expected R ln 2 if all Ce spins ordered. Low temperature neutron diffraction measurements confirm that the transition at 2.2 K is magnetic and is associated with the ordering of the Ce spins. The magnetic unit cell is double the nuclear one along the a and c axes, and contains 48 Ce ions. Only the Ce ions in the Ce - Al chains participate in the ordering at 2.2 K, and they are coupled antiferromagnetically.

Original languageEnglish
Pages (from-to)6426-6428
Number of pages3
JournalJournal of Applied Physics
Volume83
Issue number11
DOIs
StatePublished - 1998

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