Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability and superconductivity of 4d and 5d transition metal
  high-entropy alloys   We report the synthesis of new equimolar high-entropy alloys (HEAs) formed
from five or six 4d/5d transition metals that are each from a different Group
of the Periodic Table. These include MoReRuRhPt and MoReRuIrPt, which have a
valence electron count (VEC) of 8 and crystallise in the hexagonal close-packed
(hcp) structure, making them isoelectronic and isostructural to the elements Ru
and Os and the high-pressure phase of the well-known HEA CrMnFeCoNi. Analogous
HEAs with VECs of 7, 6 and 5 crystallise with multiple phases, which we
rationalise using the atomic size difference, ${\delta}$, and the
electronegativity difference, ${\Delta}$${\chi}$, of the constituent elements.
Finally, we find our hcp and mixed hcp-${\sigma}$ phase HEAs to be
superconductors, and compare their critical temperatures to those of
isostructural elements and other HEAs that have recently been reported.

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The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
2
The categories of this paper are: math