Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exotic superconductivity in the coexistent phase of antiferromagnetism
  and superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR study under
  hydrostatic pressure   We report a pressure ($P$) effect on CeCu$_2$(Si$_{0.98}$Ge$_{0.02}$)$_2$
where an antiferromagnetic (AFM) order at $T_N \sim$ 0.75 K coexists with
superconductivity below $T_c \sim$ 0.4 K\@. At pressures exceeding $P = 0.19$
GPa, the AFM order is suppressed, which demonstrates that the sudden emergence
of AFM order due to the Ge doping is ascribed to the intrinsic lattice
expansion. The exotic superconductivity at $P = 0$ GPa is found to evolve into
a typical heavy-fermion one with a line-node gap above $P = 0.91$ GPa\@. We
highlight that the anomalous enhancement in nuclear spin-lattice relaxation
rate $1/T_1$ that follows a $T_1T$ = const. behavior well below $T_c$ at $P$ =
0 GPa is characterized by the persistence of low-lying magnetic excitations,
which may be inherent to the coexistent state of antiferromagnetism and
superconductivity.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess