Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure-induced reemergence of superconductivity in BaIr2Ge7 and
  Ba3Ir4Ge16 with cage structures   The clathrate-like or caged compounds have attracted continuing interest due
to their structural flexibility as well as fertile physical properties. Here we
report a pressure-induced reemergence of superconductivity in BaIr2Ge7 and
Ba3Ir4Ge16, two new caged superconductors with two-dimensional building blocks
of cage structures. After suppressing the ambient-pressure superconducting
(SC-I) state, a new superconducting (SC-II) state emerges unexpectedly, with Tc
increased to a maximum of 4.4 K and 4.0 K for BaIr2Ge7 and Ba3Ir4Ge16,
respectively. Combined with high-pressure synchrotron x-ray diffraction and
Raman measurements, we propose that the reemergence of superconductivity in the
caged superconductors can be ascribed to a pressure-induced phonon softening
linked to the cage shrink.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph