CHEMICAL CHARACTERIZATION AND SUPERCONDUCTIVITY OF TL2BA2-XLAXCUOY WITH THE ORTHORHOMBIC AND TETRAGONAL STRUCTURES

被引：6

作者：

NAKAJIMA, S

OKU, T

SUZUKI, R

KIKUCHI, M

HIRAGA, K

SYONO, Y

机构：

[1] TOHOKU UNIV,FAC SCI,AOBA KU,SENDAI,MIYAGI 980,JAPAN

[2] KYOTO UNIV,FAC ENGN,SAKYO KU,KYOTO 606,JAPAN

来源：

PHYSICA C | 1993年 / 214卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(93)90110-C

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Oxygen contents and metal ratios of oxygen-annealed Tl2Ba2CuOy were determined by iodometric titration and energy dispersive X-ray spectroscopy (EDX) analysis, respectively. T(c) and unit cell dimensions of Tl2Ba2-xLaxCuOy phase with two structures, orthorhombic and tetragonal, have been investigated for a wide substitution range of La for Ba. The discrepancies between the orthorhombic and tetragonal phases are explained by the difference in the Tl content, but are not related to the superconductivity. Oxygen-annealed Tl2Ba2CuOy was not superconducting due to overdoping and T(c) increased to about 50 K with increasing x up to x = 0.2-0.4. The average Cu valence Of Tl2Ba2-xLaxCuOy calculated by assuming In (111) was about 1.8-2.1 +, which might be too low for a T(c) about 50 K. It was suggested that the over-doping state in Tl2Ba2CuOy was ascribable to charge transfer Tl3-t-(Cu-O)p.

引用

页码：80 / 86

页数：7

共 25 条

[1] HEWAT AW, 1988, PHYSICA C, V156, P369, DOI 10.1016/0921-4534(88)90760-5
[2] HEWAT EA, 1988, PHYSICA C, V156, P375, DOI 10.1016/0921-4534(88)90761-7
[3] PREPARATION AND X-RAY CHARACTERIZATION OF SUPERCONDUCTING AND RELATED TL2BA2CUO6 PHASES
HUANG, TC
LEE, VY
KARIMI, R
BEYERS, R
PARKIN, SSP
[J]. MATERIALS RESEARCH BULLETIN, 1988, 23 (09) : 1307 - 1314
[4] Iijima S., 1989, Mechanisms of High Temperature Superconductivity. Proceedings of the 2nd NEC Symposium, P304
[5] PREPARATION OF PURE TL2BA2CUO6+/-X - THE CONTRIBUTION OF PHASE-EQUILIBRIUM STUDIES
JORDA, JL
JONDO, TK
ABRAHAM, R
COHENADAD, MT
OPAGISTE, C
COUACH, M
KHODER, A
SIBIEUDE, F
[J]. PHYSICA C, 1993, 205 (1-2): : 177 - 185
[6] THERMOGRAVIMETRIC STUDIES OF THE OVER-DOPING STATE OF TL2BA2CUO6-DELTA DUE TO CHARGE-TRANSFER
KIKUCHI, M
NAKAJIMA, S
SYONO, Y
NAGASE, K
SUZUKI, R
KAJITANI, T
KOBAYASHI, N
MUTO, Y
[J]. PHYSICA C, 1990, 166 (5-6): : 497 - 501
[7] PREPARATION OF THE BULK SUPERCONDUCTOR TL2BA2CA3CU4O12
KIKUCHI, M
NAKAJIMA, S
SYONO, Y
HIRAGA, K
OKU, T
SHINDO, D
KOBAYASHI, N
IWASAKI, H
MUTO, Y
[J]. PHYSICA C, 1989, 158 (1-2): : 79 - 82
[8] PREPARATION AND CHEMICAL-COMPOSITION OF SUPERCONDUCTING OXIDE TL2BA2CA1-1CU1O2(1)+4, TL2BA2CA2-1CU2O2(2)+4, TL2BA2CA3-1CU3O2(3)+4
KIKUCHI, M
KAJITANI, T
SUZUKI, T
NAKAJIMA, S
HIRAGA, K
KOBAYASHI, N
IWASAKI, H
SYONO, Y
MUTO, Y
[J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1989, 28 (03): : L382 - L385
[9] LARGE TC-VARIATION FROM 0K TO 80K AND HOLE CONCENTRATION IN TL2BA2CUO6
KUBO, Y
SHIMAKAWA, Y
MANAKO, T
SATOH, T
IIJIMA, S
ICHIHASHI, T
IGARASHI, H
[J]. PHYSICA C, 1989, 162 : 991 - 992
[10] CRYSTAL-STRUCTURES AND SUPERCONDUCTIVITY OF SUPERCONDUCTING PHASES IN THE TL-BA-CA-CU-O SYSTEM
LIANG, JK
ZHANG, YL
HUANG, JQ
XIE, SS
CHE, GC
CHEN, XR
NI, YM
ZHEN, DN
JIA, SL
[J]. PHYSICA C, 1988, 156 (04): : 616 - 624

← 1 2 3 →