Abstract
By annealing in oxygen at high pressure around 600 ≈ 1000 atm, we have been able to make a series of the single-phase solid solution system Nd(Ba 1− x Nd x ) 2Cu 3O 7+ x i.e. σ = x in Nd(Ba 1− x Nd x ) 2Cu 3O 7+ x . x-dependences of both hole concentration and superconductivity have been investigated in this system. In this series of samples, the hole concentration deduced from the Hall effect measurement changes monotonically with x while the average charge of a [CuO] unit, i.e. the total hole concentration, deduced from a chemical analysis is not changed for all samples. This clearly demonstrates that the mobile hole concentration in this system is determined by a charge transfer between CuO 2 sheet-layer and CuO 1+ x chain-layer. This charge transfer is understood by consideration of the electrostatic energy based on a simple model. x-dependence of the superconductivity transition temperature T c is interpreted as the dependence of T c on the mobile hole concentration of the CuO 2 plane, which is expressed by an almost linear relation up to the highest T c of 95 K.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
