Preliminary evidence for the occurrence of high-TC superconductivity in alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were recently obtained by magnetic susceptibility measurements and by the opening of a large superconducting gap as measured by ARPES and STM techniques. In this work, KPT samples have been synthesized by a chemical method and characterized by low-temperature Raman scattering and resistivity measurements. Here, we report the occurrence of a resistivity drop of more than 4 orders of magnitude at low temperatures in KPT samples in the form of compressed powder. This fact was interpreted as a possible sign of a broad superconducting transition taking place below ∼90 K in granular KPT. The granular nature of the KPT system appears to be also related to the ∼20 K broadening of the resistivity drop around the critical temperature.

Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition

Pinto, Nicola;Di Nicola, Corrado;Trapananti, Angela;Minicucci, Marco;Di Cicco, Andrea;Marchetti, Fabio;Pettinari, Claudio;Perali, Andrea
2020-01-01

Abstract

Preliminary evidence for the occurrence of high-TC superconductivity in alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were recently obtained by magnetic susceptibility measurements and by the opening of a large superconducting gap as measured by ARPES and STM techniques. In this work, KPT samples have been synthesized by a chemical method and characterized by low-temperature Raman scattering and resistivity measurements. Here, we report the occurrence of a resistivity drop of more than 4 orders of magnitude at low temperatures in KPT samples in the form of compressed powder. This fact was interpreted as a possible sign of a broad superconducting transition taking place below ∼90 K in granular KPT. The granular nature of the KPT system appears to be also related to the ∼20 K broadening of the resistivity drop around the critical temperature.
2020
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/446415
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