Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase transition in the magnetocrystalline anisotropy of tetragonal
  Heusler alloys: Rh$_2T$Sb, $T=$ Fe, Co   This work reports on first principles calculations of the electronic and
magnetic structure of tetragonal Heusler compounds with the composition
Rh$_2$Fe$_{x}$Co$_{1-x}$Sb ($0\leq x\leq1$). It is found that the magnetic
moments increase from 2 to 3.4~$\mu_B$ and the Curie temperature decreases from
500 to 464~K with increasing Fe content $x$. The $3d$ transition metals make
the main contribution to the magnetic moments, whereas Rh contributes only
approximately 0.2~$\mu_B$ per atom, independent of the composition. The paper
focuses on the magnetocrystalline anisotropy of the borderline compounds
Rh$_2$FeSb, Rh$_2$Fe$_{0.5}$Co$_{0.5}$Sb, and Rh$_2$CoSb. A transition from
easy-axis to easy-plane anisotropy is observed when the composition changes
from Rh$_2$CoSb to Rh$_2$FeSb. The transition occurs at an iron concentration
of approximately 40\%.

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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol