Appearance of the octupole ordered phase IV in CexLa1−xB6

We investigated the physical properties of CexLa1−xB6 at x∼0.8, below which the Tβ-type antiferro-octupole (AFO) ordered phase IV appears as a result of the larger suppression rate of TQ than TN by La doping. The most important result is that while the peak of the specific heat at TQ is rapidly supp...

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Bibliographic Details
Published in:Physical review. B 2018-05, Vol.97 (18)
Main Authors: Sera, M, Kunimori, K, Matsumura, T, Kondo, A, Tanida, H, Tou, H, Iga, F
Format: Article
Language:English
Subjects:
Doping
Lattices (mathematics)
Phase diagrams
Physical properties
Subgroups
Online Access:Get full text
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Summary:We investigated the physical properties of CexLa1−xB6 at x∼0.8, below which the Tβ-type antiferro-octupole (AFO) ordered phase IV appears as a result of the larger suppression rate of TQ than TN by La doping. The most important result is that while the peak of the specific heat at TQ is rapidly suppressed and broadened by La doping, that at TIV is sharp and large. This indicates that although the Tβ-AFO order in the phase IV is robust against the local lattice distortion induced by La doping, the Oxy-type antiferroquadrupole (AFQ) ordered phase II is very weak. The Txyz-AFO interaction is robust against La doping from the observation of the pronounced enhancement of TQ even in a small x region. Based on these La-doping effect of the multipole interactions, we carried out the mean-field calculation for the four-sublattice model to reproduce the magnetic phase diagrams of CexLa1−xB6. Based on the calculated results, we propose that the small splitting of the quartet is induced by La doping in phase I to explain the magnetic phase diagram for x
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.97.184417