Coexistence of Diamagnetism and Vanishingly Small Electrical Resistance at Ambient Temperature and Pressure in Nanostructures

Abstract

The great practical utility has motivated extensive efforts to discover ultra-low resistance electrical conductors and superconductors in ambience. Here we report the observation of vanishingly small electrical resistance at the ambient temperature and pressure conditions in films and pellets of a nanostructured material that is composed of silver particles embedded into a gold matrix. Upon cooling below a sample-specific temperature scale ($T_C$) as high as $286$ K, the film resistance drops below $\sim 2\mu \Omega$, being limited by measurement uncertainty. The corresponding resistivity ($\sim 10^{-12}$ $\Omega$.m) is at least four orders of magnitude below that of elemental noble metals, such as gold, silver or copper. Furthermore, the samples become strongly diamagnetic below $T_C$, with volume susceptibilities as low as -0.056. We additionally describe methods to tune $T_C$ to temperatures much higher than room temperature.

arXiv commenttypos corrected, Movie S1 link added

Cited by in corpus (9)

• Enhancement of the density of states at the Fermi level due to oxygen atoms in noble metals
• Study of electrical conductivity of the coatings of bimetallic Au-Ag nanoparticles
• Observations of zero electrical resistance of Au-Ag thin films near room temperature
• Comment on arXiv:1807.08572, "Coexistence of Diamagnetism and Vanishingly Small Electrical Resistance at Ambient Temperature and Pressure in Nanostructures"
• Current-voltage characteristics in Ag/Au nanostructures at resistive transitions
• Repeated noise pattern in the data of arXiv:1807.08572, "Evidence for Superconductivity at Ambient Temperature and Pressure in Nanostructures"
• Superconductivity in Nanostructures as a Consequence of Local Pairing and Bose-Einstein-Condensation of Pairs
• Ag-Au alloys BCS-like Superconductors?
• Observation of excess resistance anomaly at resistive transitions in Ag/Au nanostructures