Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of the metallic state of LaNiO$_3$/LaAlO$_3$ superlattices
  measured by $^8$Li $\beta$-detected NMR   Using ion-implanted $^8$Li $\beta$-detected NMR, we study the evolution of
the correlated metallic state of LaNiO$_3$ in a series of LaNiO$_3$/LaAlO$_3$
superlattices as a function of bilayer thickness. Spin-lattice relaxation
measurements in an applied field of 6.55 T reveal two equal amplitude
components: one with metallic ($T$-linear) $1/T_{1}$, and a second with a more
complex $T$-dependence. The metallic character of the slow relaxing component
is only weakly affected by the LaNiO$_3$ thickness, while the fast component is
much more sensitive, exhibiting the opposite temperature dependence (increasing
towards low $T$) in the thinnest, most magnetic samples. The origin of this
bipartite relaxation is discussed.

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The categories of this paper are: q-fin
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
10
The categories of this paper are: q-bio