METAL-SUPERCONDUCTOR-INSULATOR TRANSITION IN THE (TL1-XPBX)(CAL-YYY)SR2CU2O7-DELTA SYSTEM
Journal
Physica B
Journal Volume
165
Pages
1683-1684
Date Issued
1990
Author(s)
Abstract
The (Tl1-xPbx)(Ca1-yYy)Sr2Cu2O7-δ system exhibits the highest superconducting transition temperature (110K), at x=0.5 and y=0.2, yet observed in the TlCaBa2Cu2O7-δ (1122) structure type. This complex, six-blend combination of metallic elements which make up the material is, however, compensated by a relatively simple crystal structure, which bears many similarities to that of 90K superconductor YBa2Cu3O7-δ. In this letter we report some important features of the cation-substitution chemistry of the title compound, drawing attention to the fundamental changes in the electronic properties and the metal-superconductor-insulator transition of the (Tl1-xPbx)(Ca1-yYy)Sr2Cu2O7-δ system as Tl3+ and Ca2+ in replaced by Pb4+ and Y3+, respectively. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.
Type
journal article