Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetism and Superconductivity in RuM1.5Ce0.5Sr2Cu2O10 (M=Eu and Y)   RuY1.5Ce0.5Sr2Cu2O10, is not superconducting (SC) and orders magnetically at
TM =152 K. The Ru moment at 5K is 0.75 mB. Ferromagnetic hysteresis loops are
observed below Tirr= 100 K. At 100 K, the remanent magnetization (Mrem) and the
coercive field (HC) become zero. Surprisingly, at Tirr <T< TM a reappearance of
antiferromagnetic (AFM) hysteresis loops are observed with a peak at 120 K for
both Mrem and HC. The paramagnetic constants are: Peff =2.06 mB (greater than
the 1.73 mB expected for low spin Ru5+) and q= 136 K which agrees well with TM.
Substitution of Zn (2.5% atm.) for Cu in RuEu1.5Ce0.5Sr2Cu2O10 (TC=38 K),
suppresses TC but does not affect the magnetic features such as: TM and Tirr,
Mrem and HC. This indicates that both SC and magnetic states are practically
decoupled. We argue that the magnetic structure of this system becomes (i) AFM
ordered at TM. (ii) Due to the tilting of the RuO6 octahedra away from the
crystallographic c axis, at Tirr < TM, weak-ferromagnetic (W-FM) order is
induced by the canting of the Ru moments. (iii) At TC (TM/TC~4), the specific
materials (M=Eu, Gd) become SC. Below TC, both SC and W-FM states coexist.

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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: chem-ph