Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coexistence of magnetic order and valence fluctuations in the Kondo
  lattice system Ce$_2$Rh$_3$Sn$_5$   We report on the electronic band structure, structural, magnetic and thermal
properties of Ce$_2$Rh$_3$Sn$_5$. Ce $L_{\mathrm{III}}$-edge XAS spectra give
direct evidence for an intermediate valence behaviour. Thermodynamic
measurements reveal magnetic transitions at $T_{\mathrm{N1}}\approx$ 2.9 K and
$T_{\mathrm{N2}}\approx$ 2.4 K. Electrical resistivity shows behaviour typical
for Kondo lattices. The coexistence of magnetic order and valence fluctuations
in a Kondo lattice system we attribute to a peculiar crystal structure in which
Ce ions occupy two distinct lattice sites. Analysis of the structural features
of Ce$_2$Rh$_3$Sn$_5$, together with results of electronic band structure
calculations and thermodynamic data indicate that Ce2 ions are in an
intermediate valence state with the ground state electronic configuration close
to 4$f^0$, whereas Ce1 ions are trivalent (4$f^1$) and contribute to the low
temperature magnetic ordering. Thus, our joined experimental and theoretical
investigations classify Ce$_2$Rh$_3$Sn$_5$ as a multivalent charge-ordered
system.

23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg