Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Evidence of a change of Exchange Anisotropy Sign with
  Temperature in Zn-Substituted Cu2OSeO3   We report small-angle neutron scattering from the conical state in a single
crystal of Zn-substituted Cu2OSeO3. Using a 3D vector-field magnet to reorient
the conical wavevector, our measurements show that the magnitude of the conical
wavevector changes as a function of crystallographic direction. These changes
are caused by the anisotropic exchange interaction (AEI), whose magnitude
transitions from a maxima to a minima along the <111> and <100>
crystallographic directions respectively. We further find that the AEI constant
undergoes a change of sign from positive to negative with decreasing
temperature. Unlike in the related compound FeGe, where similar behaviour of
the AEI induces a reorientation of the helical wavevector, we show that the
zero field helical wavevector in (Cu0.98Zn0.02)2OSeO3 remains along the <100>
directions at all temperatures due to the competing fourth-order
magnetocrystalline anisotropy becoming dominant at lower temperatures.

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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: econ
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: stat