Comparative transport studies of '1212' superconductors

Authors

Albert A. Gapud Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños
Judy Z. Wu Department of Physics and Astronomy, University of Kansas
Shaolin Yan Department of Physics and Astronomy, University of Kansas
Yi-Yuan Xie Department of Physics and Astronomy, University of Kansas
Byeongwon Kang Department of Physics and Astronomy, University of Kansas
Michael P. Siegal Sandia National Laboratories, Albuquerque
Don L. Overmyer Sandia National Laboratories, Albuquerque

Abstract

The purpose of this study is to ascertain the nature of the 30-K shift in the critical temperature (T_c) in exchanging the Tl cation in TlBa₂CaCu₂O_6+δ (Tl-1212, T_c ~ 90 K) with the Hg cation to produce HgBa₂CaCu₂O_6+δ (Hg-1212, T_c ~ 120 K). This rare availability of high quality samples of both '1212' species makes this study possible, and could shed new light on the still-unexplained mechanism of high-temperature superconductivity. Since the Hg-1212 films were fabricated from Tl-1212 by replacing Tl cations by Hg cations the superconducting '1212' layered structured is preserved under this cation exchange; therefore the T_c shift is not due to the anisotropic layered structure prevalent in high-temperature superconductors, but more likely due to differences in the electronic structure and charge carrier density. It will be shown that the T_c shift is due primarily to a shift in charge carrier density.

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Issue

1999: Proceedings of the 17th National Physics Congress of the Samahang Pisika ng Pilipinas

Article ID

SPP-1999-CM-03

Section

Condensed Matter Physics

Published

1999-10-22

How to Cite

[1]

AA Gapud, JZ Wu, S Yan, Y-Y Xie, B Kang, MP Siegal, and DL Overmyer, Comparative transport studies of ’1212’ superconductors, Proceedings of the Samahang Pisika ng Pilipinas 17, SPP-1999-CM-03 (1999). URL: https://proceedings.spp-online.org/article/view/SPP-1999-CM-03.