The Determination of the Specific Capacitance of Mercury Based Copper Oxide Layered Superconductor at Superconducting State
Abstract
Mercury based copper oxide layered high temperature superconductor,
which consists of superconductor–insulator–superconductor (SIS) layers, can be
considered as a stack of nearly ideal, intrinsic Josephson junctions (IJJ). The
SIS junction, where the electrical field is confined, topologically resembles a
parallel-plate capacitor. As is known, the coupling between junctions in superconductors
is capacitive. Hence, the determination of the specific capacitance (Cs) of the IJJ at the
superconducting state has a crucial importance in order to give information
about superconductivity mechanism. In this study, the Cs values of the investigated sample have been
calculated by means of the critical current density, Jcand plasma frequency, that have been obtained from
magnetic measurements taken at the below temperatures than the critical
transition temperature, Tc.
Moreover, Cs values at superconducting
temperature have been compared to that of the normal temperature.
Keywords
intrinsic Josephson junctions,copper oxide layer,Specific capacitance
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