Author:
Pinto Nicola,Di Nicola Corrado,Trapananti Angela,Minicucci Marco,Di Cicco Andrea,Marcelli Augusto,Bianconi Antonio,Marchetti Fabio,Pettinari Claudio,Perali Andrea
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.
Subject
Condensed Matter Physics,Electronic, Optical and Magnetic Materials
Cited by
10 articles.
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