Hole concentration and critical temperature in the Tl2−x−zBa2Ca2+xCu3O10−y system

✍ Scribed by M. Paranthaman; M. Foldeaki; A.M. Hermann

• Book ID: 103946047
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 360 KB
• Volume: 192
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90756-3

✦ Synopsis

BazCa2+xCusOto_y system with x between 0 and 0.4. A small impurity phase was found at x= 0.6. All samples were found to be tetragonal. The lattice parameters a and c were nearly constant with the value of 3.858 + 0.002 A. and 35.7 i _+ 0.01 A, respectively. The T¢ vaned between 112 and 118 K for the "'as-synthesized" samples. Wet chemical analysis showed that all samples were both Ti and oxygen deficient. The Tc was found to increase with increasing hole concentration. The origin of the holes for all these samples is due to Ca 2+ substitution on the TP + sites and overlap of TI-6s band with the conduction band of the CuO2 sheets. Furthermore, the TI-6s band overlap was found to be constant for all the samples studied.