Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetotransport and Superconductivity of Alpha-Uranium   We have measured the electrical resistivity, magnetoresistance, and Hall
effect on several new single crystal samples and one polycrystalline sample of
alpha-uranium. The residual resistivity ratios of these samples vary from 13 to
315. Matthiessen's law appears to hold above the onset of the charge density
wave phase transitions that begin near 43 K, but not below this temperature.
Sharp features at all three charge density wave transitions are observed and
the effects of high magnetic fields on them are presented and discussed. The
magnetoresistance is anisotropic, reaches 1000% at 2 K and 18 T, and does not
exhibit Kohler scaling. The Hall coefficient is positive, independent of
magnetic field, and slightly temperature dependent above about 40 K in
agreement with earlier studies. Below 40 K the Hall coefficient changes sign as
the temperature falls, varies with field, and becomes much more strongly
negative at the lowest temperatures than has been reported. Some of our results
suggest that a spin density wave may coexist with the charge density wave
states. Superconductivity is observed in two of our samples, we argue that it
is intrinsic to alpha-uranium and suggest that it is consistent with a two-band
model. Several parameters characterizing the transport and superconductivity of
alpha-uranium are estimated.

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The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg