Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Subamorphous thermal conductivity of crystalline half-Heusler
  superlattices   The quest to improve the thermoelectric figure of merit has mainly followed
the roadmap of lowering the thermal conductivity while keeping unaltered the
power factor of the material. Ideally an electron-crystal phonon-glass system
is desired. In this work, we report an extraordinary reduction of the
cross-plane thermal conductivity in crystalline (TiNiSn):(HfNiSn) half-Heusler
superlattices. We create SLs with thermal conductivities below the effective
amorphous limit, which is kept in a large temperature range (120-300 K). We
measured thermal conductivity at room temperature values as low as 0.75 W/(m
K), the lowest thermal conductivity value reported so far for half-Heusler
compounds. By changing the deposition conditions, we also demonstrate that the
thermal conductivity is highly impacted by the way the single segments of the
superlattice grow. These findings show a huge potential for thermoelectric
generators where an extraordinary reduction of the thermal conductivity is
required but without losing the crystal quality of the system.

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The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci