Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in palladium hydride and deuteride at 52-61 kelvin   We report the observation of conventional superconductivity at the highest
temperature yet attained without mechanical compression, around 54 kelvin in
palladium-hydride and 60 kelvin in palladium-deuteride. The remarkable increase
in Tc compared to the previously known value was achieved by rapidly cooling
the hydride and deuteride after loading with hydrogen or deuterium at elevated
temperature. Our results encourage hope that conventional superconductivity
under ambient conditions will be discovered in materials with very high
hydrogen density, as predicted more than a decade ago.

17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom