ENHANCED CRITICAL CURRENT-DENSITY IN CA-DOPED Y1BA2CU4O8

被引:7
作者
NARWANKAR, PK
CHANDRACHOOD, MR
MORRIS, DE
SINHA, APB
机构
关键词
D O I
10.1063/1.104558
中图分类号
O59 [应用物理学];
学科分类号
摘要
The J(c) of Ca0.1Y0.9Ba2Cu4O8 (Ca-1:2:4) synthesized in elevated oxygen pressure is found to be > 10(6) A/cm2 at low temperatures and fields, two orders of magnitude greater than the J(c) of undoped Y1Ba2Cu4O8 (1:2:4). The J(c) (determined by magnetic hysteresis measurements) remains high (5 X 10(5) A/cm2) up to B = 4 T at 5 K, and is still > 10(4) A/cm2 at 40 K and 4 T indicating strong flux pinning. At 77 K, J(c) drops to 10(3) A/cm2 at B = 1 T. Ca-1:2:4 was partially converted to 1:2:3 + CuO by brief thermal treatment to generate additional flux pinning centers, but J(c) did not improve further.
引用
收藏
页码:651 / 653
页数:3
相关论文
共 27 条
[1]   OXIDE CHEMISTRY .2. TERNARY OXIDES CONTAINING COPPER IN OXIDATION STATES-1, STATES-2, STATES-3, AND STATES-4 [J].
ARJOMAND, M ;
MACHIN, DJ .
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 1975, (11) :1061-1066
[2]   MAGNETIZATION OF HARD SUPERCONDUCTORS [J].
BEAN, CP .
PHYSICAL REVIEW LETTERS, 1962, 8 (06) :250-+
[3]   POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].
BEDNORZ, JG ;
MULLER, KA .
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193
[4]   FIELD-INDUCED BROADENING OF THE RESISTIVE TRANSITION AND 2-DIMENSIONAL NATURE OF FLUX PINNING IN Y2BA4CU8O16 FILMS [J].
BUDHANI, RC ;
WELCH, DO ;
SUENAGA, M ;
SABATINI, RL .
PHYSICAL REVIEW LETTERS, 1990, 64 (14) :1666-1669
[5]   SYNTHESIS OF BULK SUPERCONDUCTING YBA2CU4O8 AT ONE ATMOSPHERE OXYGEN-PRESSURE [J].
CAVA, RJ ;
KRAJEWSKI, JJ ;
PECK, WF ;
BATLOGG, B ;
RUPP, LW ;
FLEMING, RM ;
JAMES, ACWP ;
MARSH, P .
NATURE, 1989, 338 (6213) :328-330
[6]   A STRAIGHTFORWARD SYNTHETIC ROUTE TO THE BULK FORM OF THE ERBA2CU4O8, HOBA2CU4O8 SUPERCONDUCTORS AT ONE ATMOSPHERE OXYGEN-PRESSURE [J].
CAVA, RJ ;
KRAJEWSKI, JJ ;
PECK, WF ;
BATLOGG, B ;
RUPP, LW .
PHYSICA C, 1989, 159 (04) :372-374
[7]   PHASE-DIAGRAM AND NEW PHASES IN THE Y-BA-CU-O SYSTEM AT HIGH OXYGEN-PRESSURE [J].
CHANDRACHOOD, MR ;
MORRIS, DE ;
SINHA, APB .
PHYSICA C, 1990, 171 (1-2) :187-193
[8]   ENHANCED FLUX PINNING BY PHASE-DECOMPOSITION IN Y-BA-CU-O [J].
JIN, S ;
TIEFEL, TH ;
NAKAHARA, S ;
GRAEBNER, JE ;
OBRYAN, HM ;
FASTNACHT, RA ;
KAMMLOTT, GW .
APPLIED PHYSICS LETTERS, 1990, 56 (13) :1287-1289
[9]   BULK SYNTHESIS OF THE 81-K SUPERCONDUCTOR YBA2CU4O8 AT HIGH OXYGEN-PRESSURE [J].
KARPINSKI, J ;
KALDIS, E ;
JILEK, E ;
RUSIECKI, S ;
BUCHER, B .
NATURE, 1988, 336 (6200) :660-662
[10]  
MAEDA H, 1988, JPN J APPL PHYS PT 2, V27, P209