Abstract
Bond covalency and valence of elements in HgBa 2Ca n−1 Cu n O 2 n+2+ δ ( n=1, 2, 3, 4) were calculated and their relationship with T c was discussed. For both oxygen and argon annealed samples, the results indicated that with the increase of n, the trend of bond covalency of Hg–O and Cu–O was the same or opposite compared with that of superconducting temperature. This may suggest that the magnitudes of Cu–O and Hg–O bond covalency are important in governing the superconducting temperature. For the highest T c sample, Hg had the lowest valence, implying that lower valence of Hg was preferred in order to produce higher T c. For fixed n, the valence of Cu in oxygen annealed samples was larger than that in argon annealed samples, indicating that oxygen annealed samples produced more carriers than argon annealed samples.
Sign-in/Register to access full text options 
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.
