Not a Simple Ferro-quadrupole Order in DyB6

Masafumi Sera, Takumi Yonemura, Ken Itamochi, Takeshi Matsumura, Masahiko Hiroi, Kohki Takahashi

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We performed detailed measurements of the thermal and magnetic properties in the ferroquadrupole (FQ) ordered state of DyB6, which exhibits the antiferromagnetic (AFM) order at TN = 26 K and the O2 0½111 -type FQ order at TQ = 32 K. We also performed the mean-field calculation for the two-sublattice model in which the crystalline electric field (CEF) effect and AFM and FQ interactions are taken into account, focusing on the FQ ordered state. We could estimate the CEF level scheme to reproduce the temperature dependence of the magnetic susceptibility and specific heat. We could also reproduce the temperature dependence of the specific heat in the ordered state by the calculation quite well. However, the thermal and magnetic properties in magnetic fields, i.e., a decrease in the magnetic susceptibility below TQ, a nearly temperature-independent behavior of the electrical resistivity between TN and TQ, the magnetic phase diagram for H ∥ [111] and so forth could not be reproduced by the calculation where the dependence of the domain distribution on the magnetic field direction is taken into account.

Original languageEnglish
Article number054703
JournalJournal of the Physical Society of Japan
Issue number5
Publication statusPublished - 2019


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