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

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 n...

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Bibliographic Details
Published in:arXiv.org 2019-05
Main Authors: Thapa, Dev Kumar, Islam, Saurav, Saha, Subham Kumar, Phanibhusan Singha Mahapatra, Bhattacharyya, Biswajit, Sai, T Phanindra, Mahadevu, Rekha, Patil, Satish, Ghosh, Arindam, Pandey, Anshu
Format: Article
Language:English
Subjects:
Ambient temperature
Diamagnetism
Gold
Nanostructured materials
Silver
Superconductivity
Temperature
Transition temperature
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Summary: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.
ISSN:2331-8422