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
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...
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2021-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5476 |
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| author | Innocent C. Ezenwa Takashi Yoshino |
| author_facet | Innocent C. Ezenwa Takashi Yoshino |
| author_sort | Innocent C. Ezenwa |
| collection | DOAJ |
| description | 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 <i>d</i>-band with increasing pressure. |
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| id | doaj.art-c9c8c751b3c54c35aa447c14bd63824a |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:57:19Z |
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| spelling | doaj.art-c9c8c751b3c54c35aa447c14bd63824a2023-11-22T16:22:26ZengMDPI AGMaterials1996-19442021-09-011419547610.3390/ma14195476Electrical 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 MetalsInnocent C. Ezenwa0Takashi Yoshino1Institute for Planetary Materials, Okayama University, 827 Yamada Street, Misasa, Tottori 682-0193, JapanInstitute for Planetary Materials, Okayama University, 827 Yamada Street, Misasa, Tottori 682-0193, JapanThe 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 <i>d</i>-band with increasing pressure.https://www.mdpi.com/1996-1944/14/19/5476electrical resistivitythermal conductivityelectrons and phonons interactionshigh pressure and temperatureconstant resistivitymelting curve |
| spellingShingle | Innocent C. Ezenwa Takashi Yoshino 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 Materials electrical resistivity thermal conductivity electrons and phonons interactions high pressure and temperature constant resistivity melting curve |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | electrical resistivity thermal conductivity electrons and phonons interactions high pressure and temperature constant resistivity melting curve |
| url | https://www.mdpi.com/1996-1944/14/19/5476 |
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