Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doping effects of Co, Ni, and Cu in FeTe0.65Se0.35 single crystals   The resistivity, magnetoresistance, and magnetic susceptibility are measured
in single crystals of FeTe0.65Se0.35 with Cu, Ni, and Co substitutions for Fe.
The crystals are grown by Bridgman's method. The resistivity measurements show
that superconductivity disappears with the rate which correlates with the
nominal valence of the impurity. From magnetoresistance we evaluate doping
effect on the basic superconducting parameters, such as upper critical field
and coherence length. We find indications that doping leads to two component
superconducting behavior, possibly because of local charge depression around
impurities.

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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys