Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ferromagnetic ordering along the hard axis in the Kondo lattice YbIr3Ge7   Ferromagnetic Kondo lattice compounds are far less common than their
antiferromagnetic analogs. In this work, we report the discovery of a new
ferromagnetic Kondo lattice compound, YbIr3Ge7. Like 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. AC magnetic
susceptibility, magnetization, and specific heat measurements show that
YbIr3Ge7 has a Kondo temperature TK = 14 K and a Curie temperature TC = 2.4 K.
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.

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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org