Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterization of the pressure coefficient of manganin and temperature
  evolution of pressure in piston-cylinder cells   We report measurements of the temperature- and pressure-dependent resistance,
$R(T,p)$, of a manganin manometer in a $^4$He-gas pressure setup from room
temperature down to the solidification temperature of $^4$He ($T_\textrm
{solid}\sim$ 50 K at 0.8 GPa) for pressures, $p$, between 0 GPa and $\sim$0.8
GPa. The same manganin wire manometer was also measured in a piston-cylinder
cell from 300 K down to 1.8 K and for pressures between 0 GPa to $\sim$2 GPa.
From these data, we infer the temperature and pressure dependence of the
pressure coefficient of manganin, $\alpha(T,p)$, defined by the equation $R_p =
(1+\alpha p) R_0$ where $R_0$ and $R_p$ are the resistance of manganin at
ambient pressure and finite pressure, respectively. Our results indicate that
upon cooling $\alpha$ first decreases, then goes through a broad minimum at
$\sim$120 K and increases again towards lower temperatures. In addition, we
find that $\alpha$ is almost pressure-independent for $T\gtrsim$60 K up to
$p\sim$2 GPa, but shows a pronounced $p$ dependence for $T\lesssim$60K. Using
this manganin manometer, we demonstrate that $p$ overall decreases with
decreasing temperature in the piston-cylinder cell for the full pressure range
and that the size of the pressure difference between room temperature and low
temperatures ($T=1.8$ K), $\Delta p$, decreases with increasing pressure. We
also compare the pressure values inferred from the magnanin manometer with the
low-temperature pressure, determined from the superconducting transition
temperature of elemental lead (Pb). As a result of these data and analysis we
propose a practical algorithm to infer the evolution of pressure with
temperature in a piston-cylinder cell.

24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
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
20
The categories of this paper are: acc-phys