Electrical Resistivity of Cu and Au at High Pressure above 5 GPa: Implications for the Constant Electrical Resistivity Theory along the Melting Curve of the Simple Metals

Abstract

The electrical resistivity of solid and liquid Cu and Au were measured at high pressures from 6 up to 12 GPa and temperatures ∼150 K above melting. The resistivity of the metals was also measured as a function of pressure at room temperature. Their resistivity decreased and increased with increasing pressure and temperature, respectively. With increasing pressure at room temperature, we observed a sharp reduction in the magnitude of resistivity at ∼4 GPa in both metals. In comparison with 1 atm data and relatively lower pressure data from previous studies, our measured temperature-dependent resistivity in the solid and liquid states show a similar trend. The observed melting temperatures at various fixed pressure are in reasonable agreement with previous experimental and theoretical studies. Along the melting curve, the present study found the resistivity to be constant within the range of our investigated pressure (6–12 GPa) in agreement with the theoretical prediction. Our results indicate that the invariant resistivity theory could apply to the simple metals but at higher pressure above 5 GPa. These results were discussed in terms of the saturation of the dominant nuclear screening effect caused by the increasing difference in energy level between the Fermi level and the d-band with increasing pressure.

Investigation of Solid–Solid Transition in Ti and Zr at High Pressure by Electrical Resistivity

“…This has been observed in the electrical resistivity behavior of the normal (filled d-band states) metals such as Cu and Au at room temperature with increasing pressure. [38] We also further confirmed this phenomenon by measuring the electrical resistivity of the group (VI) metals (W and Mo) at room temperature and up to 20 GPa. As shown in Figure 3, their pressure-dependent electrical resistivity mimic each other as both rapidly decrease up to about 4 GPa with an identical slope of approximately À0.3 μΩ cm GPa À1 .…”

High Pressure Melting Curve of Fe Determined by Inter‐Metallic Fast Diffusion Technique

“…Likewise, Shen et al (2004) and Anzellini et al (2013) used the disappearance of X-ray diffraction peaks and the appearance of diffuse scattering as melting criteria. Since melting is accompanied by changes in transport properties of a material, relationships such as electrical resistivity-temperature (Ezenwa & Yoshino, 2021a;Ezenwa & Yoshino, 2021b;Geballe et al, 2021;Ohta et al, 2016;Pommier et al, 2021;Silber et al, 2018;Yin et al, 2022;Zhang et al, 2020), emissivity-temperature (e.g., Fischer & Campbell, 2010 as well as laser power-temperature (e.g., Lord et al, 2009) have been used as a melting criterion in static high-pressure studies. The lack of consensus in the melting curve of Fe (e.g., Boehler et al, 2002;Hou et al, 2021), possibly due to the uncertainties associated with the existing melting criteria necessitates the search for a new melting criterion.…”

Modelling of the conductor vaporization process for single-turn coil

“…The resistivity of the solid and liquid copper under the condition of B = 0 T, ρ TPS and ρ TPL , are both derived from the Bloch-Grüneisen theory [45].…”