Ferromagnetic ordering along the hard axis in the Kondo lattice YbIr3Ge7

Binod K. Rai, Macy Stavinoha, J. Banda, D. Hafner, Katherine A. Benavides, D. A. Sokolov, Julia Y. Chan, M. Brando, C. L. Huang, E. Morosan

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2 引文 斯高帕斯(Scopus)

摘要

Ferromagnetic Kondo lattice compounds are far less common than their antiferromagnetic analogs. In this Rapid Communication, we report the discovery of a ferromagnetic Kondo lattice compound, YbIr3Ge7. As in almost all ferromagnetic Kondo lattice systems, YbIr3Ge7 shows magnetic order with moments aligned orthogonal to the crystal electric field (CEF) easy axis. YbIr3Ge7 is unique in that it is the only member of this class of compounds that crystallizes in a rhombohedral structure with a trigonal point symmetry of the magnetic site, and it lacks broken inversion symmetry at the local moment site. The ac magnetic susceptibility, magnetization, and specific heat measurements show that YbIr3Ge7 has a Kondo temperature TK≈14 K and a Curie temperature TC=2.4K. Ferromagnetic order occurs along the crystallographic [100] hard CEF axis despite the large CEF anisotropy of the ground-state Kramers doublet with a saturation moment along [001] almost four times larger than the one along [100]. This implies that a mechanism which considers the anisotropy in the exchange interaction to explain the hard-axis ordering is unlikely. On the other hand, the broad second-order phase transition at TC favors a fluctuation-induced mechanism.

原文English
文章編號121109
期刊Physical Review B
99
發行號12
DOIs
出版狀態Published - 2019 三月 18

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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