THERMOGRAVIMETRIC STUDIES OF THE OVER-DOPING STATE OF TL2BA2CUO6-DELTA DUE TO CHARGE-TRANSFER

被引：24

作者：

KIKUCHI, M

NAKAJIMA, S

SYONO, Y

NAGASE, K

SUZUKI, R

KAJITANI, T

KOBAYASHI, N

MUTO, Y

机构：

[1] CASIO COMP CO LTD,HACHIOJI RES CTR,HACHIOJI 192,JAPAN

[2] TOHOKU UNIV,COLL EDUC,SENDAI,MIYAGI 980,JAPAN

来源：

PHYSICA C | 1990年 / 166卷 / 5-6期

关键词：

D O I：

10.1016/0921-4534(90)90050-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Variation of the Tc of Tl2Ba2CuO6-δ (2201) was demonstrated under various synthesis conditions: annealing atmosphere and quenching temperature. The oxygen vacancy (δ) was determined precisely by thermogravimetric analysis in oxygen and nitrogen atmospheres. The nonsuperconducting phase (δ{reversed tilde equals}0) in Tl2Ba2CuO6-δ due to charge transfer Tl3-t-(Cu-O)p was turned into a superconducting state by the introduction of a small amount of oxygen vacancies (δ>0). The highest Tc value of 85 K was achieved with an optimum value of δ{reversed tilde equals}0.15 by annealing at 600°C in a nitrogen atmosphere. © 1990.

引用

页码：497 / 501

页数：5

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