Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-23
Physical Review B 78 (2008) 014415
Physics
Condensed Matter
Strongly Correlated Electrons
Abstract of submission changed to get rid of LaTeX code Minor differences exist between this version and that published in PRB
Scientific paper
10.1103/PhysRevB.78.014415
Magnetic ordering phenomena in CexPr1-xB6 solid solutions have been studied using both powder and single-crystal neutron diffraction. A variety of magnetic structures are observed depending on temperature and Ce concentration. Over a broad composition range (x $\le$ 0.7), Pr-Pr interactions play a dominant role, giving rise to incommensurate structures with wave vectors of the form k{IC1}=(1/4-delta, 1/4, 1/2) or k{IC2}=(1/4-delta, 1/4-delta, 1/2). The crossover to a CeB6-like regime takes place near x = 0.7-0.8. For the latter composition, the antiferroquadrupolar phase transition observed in transport measurements precedes the onset, at lower temperature, of a commensurate magnetic order similar to that existing in CeB6. However, unlike in the pure compound, an incommensurate magnetic order is formed at even higher temperature and persists in the antiferroquadrupolar phase down to the lock-in transition. These results are shown to reflect the interplay between various type of dipole exchange and higher multipole interactions in this series of compounds.
André Gilles
Iga Fumitoshi
Mignot Jean-Michel
Robert Julien
Sera Masafumi
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