Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing magnetic interactions between Cr adatoms on the $\beta$-Bi$_2$Pd
  superconductor   We show that the magnetic ordering of coupled atomic dimers on a
superconductor is revealed by their intra-gap spectral features. Chromium atoms
on the superconductor $\beta$-Bi$_2$Pd surface display Yu-Shiba-Rusinov bound
states, detected as pairs of intra-gap excitations in the tunneling spectra. We
formed Cr dimers by atomic manipulation and found that their intra-gap features
appear either shifted or split with respect to single atoms. The spectral
variations reveal that the magnetic coupling of the dimer changes between
ferromagnetic and antiferromagnetic depending on its disposition on the
surface, in good agreement with density functional theory simulations. These
results prove that superconducting intra-gap state spectroscopy is an accurate
tool to detect the magnetic ordering of atomic scale structures.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph