Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Field-induced spin-density wave beyond hidden order in URu2Si2   URu2Si2 is one of the most enigmatic strongly-correlated-electron systems and
offers a fertile testing ground for new concepts in condensed matter science.
In spite of >30 years of intense research, no consensus on the order parameter
of its low-temperature hidden-order phase exists. A strong magnetic field
transforms the hidden order into magnetically-ordered phases, whose order
parameter has also been defying experimental observation. Here, thanks to an
instrumentation breakthrough in high-field neutron scattering, we identify the
field-induced phases of URu2Si2 as a spin-density-wave state with wavevector k1
= (0.6 0 0). The transition to the spin-density wave represents a unique
touchstone for understanding the hidden-order phase. An intimate relationship
between this magnetic structure, the magnetic fluctuations, and the Fermi
surface is emphasized, calling for dedicated band structure calculations.

32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an