(Cu0.5Tl0.5)Ba2Can-1Cun-yGeyO2n+4-δ (n=3, 4 and y=0.5, 0.75, 1.0); superconductors with GeO2 planes

被引：13

作者：

Khan, Nawazish A. ^{[1
]}

Irfan, M. ^{[1
]}

机构：

[1] Quaid I Azam Univ, Dept Phys, Mat Sci Lab, Islamabad, Pakistan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2008年 / 468卷 / 23期

关键词：

Ge doped; (Cu0.5Tl0.5)Ba2Can-1Cun-1Cun-yGeyO2n+4-delta; (n=3; 4 and y=0.5; 0.75; 1.0); superconductors; Normal pressure synthesis; Higher T-c (R = O);

D O I：

10.1016/j.physc.2008.08.006

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have successfully synthesized germanium doped (Cu0.5Tl0.5)Ba2Can-1Cun-yGeyO2n+4-delta (n = 3, 4 and y = 0, 0.5, 0.75, 1.0) superconductors and investigated the effect of Ge doping on the superconducting properties of these compounds. The solubility of Ge till y = 1 in the CuO2 planes of (Cu0.5Tl0.5)-Ba2Ca2Cu3-yGeyO10-delta, have been found to give Superconductivity above 77 K. To our surprise an enhanced Superconductivity is observed with the doping of semiconductor germanium in some samples. The enhanced Superconductivity associated with mixed CuO2/GeO2 planes can be extremely useful for the understanding of mechanism of superconductivity; since we very well know the properties of germanium based semiconductors. (C) 2008 Elsevier B.V. All rights reserved.

引用

收藏

页码：2341 / 2344

页数：4

相关论文

共 19 条

[1] Anomalous suppression of superconductivity in Zn-substituted Bi2Sr2Ca1-xYx(Cu1-yZny)2O8+δ [J].

Akoshima, M ;

Noji, T ;

Ono, Y ;

Koike, Y .

PHYSICAL REVIEW B, 1998, 57 (13) :7491-7494

[2] New fabrication approach to fine multifilamentary Nb3(Al,Ge) superconductors using an intermediate rapid quenching technique [J].

Banno, N ;

Takeuchi, T ;

Kosuge, M ;

Yuyama, M ;

Wada, H .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2003, 13 (02) :3450-3453

[3] DISTORTED LOCAL ENVIRONMENT AROUND ZN ON CU(2) SITES IN YBA2CU3O7 - AN X-RAY-ABSORPTION STUDY [J].

BRIDGES, F ;

LI, GG ;

BOYCE, JB ;

CLAESON, T .

PHYSICAL REVIEW B, 1993, 48 (02) :1266-1275

[4] SUPERCONDUCTIVITY OF SRSI2 AND BAGE2 WITH THE ALPHA-THSI2-TYPE STRUCTURE [J].

EVERS, J ;

OEHLINGER, G ;

OTT, HR .

JOURNAL OF THE LESS-COMMON METALS, 1980, 69 (02) :389-391

[5] UPPER CRITICAL FIELDS OF HIGH-TEMPERATURE SUPERCONDUCTING NB1-Y(A11-XGEX)Y AND NB3A1 - MEASUREMENTS OF HC2 GREATER THAN 400 KG AT 4.2 DEGREES K [J].

FONER, S ;

MCNIFF, EJ ;

MATTHIAS, BT ;

GEBALLE, TH ;

WILLENS, RH ;

CORENZWI.E .

PHYSICS LETTERS A, 1970, A 31 (07) :349-&

[6] PATHS TO HIGHER TEMPERATURE SUPERCONDUCTORS [J].

GEBALLE, TH .

SCIENCE, 1993, 259 (5101) :1550-1551

[7] Correlation between superconducting critical temperature and normal-state resistivity parameters from the codoped ErBa2Cu3-x-yZnxFeyO7-δ system [J].

Gupta, A ;

Lal, R ;

Sedky, A ;

Narlikar, AV ;

Awana, VPS .

PHYSICAL REVIEW B, 2000, 61 (17) :11752-11761

[8] Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+δ [J].

Hudson, EW ;

Lang, KM ;

Madhavan, V ;

Pan, SH ;

Eisaki, H ;

Uchida, S ;

Davis, JC .

NATURE, 2001, 411 (6840) :920-924

[9] Enhanced superconductivity by mg doping in Cu1-xTlxBa2Ca2-yMgyCu0.5Zn2.5O10-δ [J].

Khan, Nawazish A. ;

Mumtaz, M. .

MATERIALS LETTERS, 2008, 62 (4-5) :659-662

[10] Enhanced superconductivity in Cu0.5Tl0.5Ba2Can-1-yBeyCunO2n+4-δ (n=3, 4 and y=0.7, 1.5, 1.7, 2.0) system with oxygen doping [J].

Khan, Nawazish A. ;

Husnain, G. ;

Sabeeh, K. .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2006, 67 (08) :1841-1849