Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct measurement of temporal correlations above the spin-glass
  transition by coherent resonant magnetic x-ray spectroscopy   In the 1970s a new paradigm was introduced that interacting quenched systems,
such as a spin-glass, have a phase transition in which long time memory of
spatial patterns is realized without spatial correlations. The principal
methods to study the spin-glass transition, besides some elaborate and elegant
theoretical constructions, have been numerical computer simulations and neutron
spin echo measurements . We show here that the dynamical correlations of the
spin-glass transition are embedded in measurements of the four-spin
correlations at very long times. This information is directly available in the
temporal correlations of the intensity, which encode the spin-orientation
memory, obtained by the technique of resonant magnetic x-ray photon correlation
spectroscopy (RM- XPCS). We have implemented this method to observe and
accurately characterize the critical slowing down of the spin orientation
fluctuations in the classic metallic spin glass alloy Cu(Mn) over time scales
of 1 to 1000 secs. Our method opens the way for studying phase transitions in
systems such as spin ices, and quantum spin liquids, as well as the structural
glass transition.

15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex