Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermoelectric power and Hall coefficient measurements on
  Ba(Fe(1-x)TMx)2As2 (TM = Co and Cu)   Temperature dependent thermoelectric power (TEP) data on Ba(Fe1-xTMx)2As2 (TM
= Co and Cu), complemented by the Hall coefficient data on the samples from the
same batches, have been measured. For Co-doping we clearly see a change in the
temperature dependent TEP and Hall coefficient data when the sample is doped to
sufficient $e$ (the number of extra electrons associated with the TM doping) so
as to stabilize low temperature superconductivity. Remarkably, a similar change
is found in the Cu-doped samples at comparable e-value, even though these
compounds do not superconduct. These changes possibly point to a significant
modification of the Fermi surface / band structure of Ba(Fe1-xTM_x)2As2 at
small electron doping, that in the case of Co-doping is just before, and
probably allows for, the onset of superconductivity. These data further suggest
that suppression of the structural / magnetic phase transition and the
establishment of a proper e-value are each necessary but, individually, not
sufficient conditions for superconductivity.

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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom