Comparative transport studies of '1212' superconductors

Authors

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