The effect of the substitution of Sm for Ba on the superconductor SmBa2Cu3Oy

被引:30
作者
Sano, M
Hayakawa, Y
Kumagawa, M
机构
[1] Research Institute of Electronics, Shizuoka University, Hamamatsu, Shizuoka 432
关键词
D O I
10.1088/0953-2048/9/6/007
中图分类号
O59 [应用物理学];
学科分类号
摘要
Characteristic changes occurring in SmBa2Cu3Oy superconductors an substituting Sm for Ba have been investigated, An appropriate amount of Sm substitution (0.05 less than or equal to 0.4, in the form of Sm1+xBa2-xCu3Oy) promoted grain growth; the grain size became larger than that in the non-substituted sample and had a maximum value at x = 0.07; Single-phase samples were obtained for 0 less than or equal to x less than or equal to 0.8. The critical temperature increased by about 1.5K for concentrations up to x = 0.02 while it decreased rapidly beyond this amount. Samples did not show superconductivity above 15 K for x greater than or equal to 0.4. The crystal structure transformed from orthorhombic to tetragonal at x = 0.3. The average valency of the Cu and the oxygen content decreased linearly with increase of x in the ranges of 0 less than or equal to x less than or equal to 0.3 and 0.7 less than or equal to x less than or equal to 0.8, while they both increased linearly for the range 0.3 less than or equal to x less than or equal to 0.7.
引用
收藏
页码:478 / 482
页数:5
相关论文
共 19 条
[1]   RELATION OF TC WITH HOLE CONCENTRATION IN SM1+XBA2-XCU3O7-DELTA, EU1+XBA2-XCU3O7-DELTA - HALL-EFFECT MEASUREMENT AND CHEMICAL-ANALYSIS [J].
AKINAGA, H ;
KATOH, H ;
TAKITA, K ;
MASUDA, K .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1989, 28 (01) :L31-L33
[2]   VARIATION OF SUPERCONDUCTING PROPERTIES WITH HOLE CONCENTRATION IN THE SOLID-SOLUTION SYSTEMS OF SM1+XBA2-XCU3O7-DELTA AND EU1+XBA2-XCU3O7-DELTA [J].
AKINAGA, H ;
KATOH, H ;
TAKITA, K ;
ASANO, H ;
MASUDA, K .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1988, 27 (04) :L610-L612
[3]   PAIR-BREAKING BY BA SITE MAGNETIC DOPANTS IN SUPERCONDUCTING NDBA2CU3OX [J].
BLACKSTEAD, HA ;
DOW, JD .
SOLID STATE COMMUNICATIONS, 1995, 96 (05) :313-316
[4]   HIGH TRANSITION-TEMPERATURE SUPERCONDUCTOR - Y-BA-CU OXIDE [J].
HIKAMI, S ;
HIRAI, T ;
KAGOSHIMA, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1987, 26 (04) :L314-L315
[5]   CRYSTAL-STRUCTURES AND SUPERCONDUCTIVITY IN EUXBA3-XCU3OY(1-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1.5) [J].
IWATA, T ;
HIKITA, M ;
TAJIMA, Y ;
TSURUMI, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1987, 26 (12) :L2049-L2051
[6]   CRYSTAL-STRUCTURE OF THE SUPERCONDUCTOR BA1.8ND1.2CU3O7-Y [J].
IZUMI, F ;
TAKEKAWA, S ;
MATSUI, Y ;
IYI, N ;
ASANO, H ;
ISHIGAKI, T ;
WATANABE, N .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1987, 26 (10) :L1616-L1619
[7]  
MUROMACHI ET, 1987, JPN J APPL PHYS, V26, pL1546
[8]   SUPERCONDUCTIVITY OF THE SYSTEM ND1+2XBA2(1-X)CU3OY(0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.4) - EFFECT OF THE MAGNETIC ND-3+ ION OCCUPYING THE BA-SITE [J].
NOZAKI, H ;
TAKEKAWA, S ;
ISHIZAWA, Y .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1988, 27 (01) :L31-L33
[9]   EFFECT OF A BARIUM DEFICIENCY ON THE STRUCTURAL AND MAGNETIC-PROPERTIES OF RE BA2-XCU3OZ (RE = Y, ND, EU, ER, YB) [J].
SAUV, K ;
NICOLAS, M ;
VANHUONG, CN ;
DUBON, A ;
LEGEAY, P ;
KANDEL, L .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 1993, 6 (05) :327-336
[10]   THE OXYGEN-DEFICIENT PEROVSKITE SOLID-SOLUTION ND1+XBA2-XCU3OY AND ITS SUPERCONDUCTIVITY [J].
TAKEKAWA, S ;
NOZAKI, H ;
ISHIZAWA, Y ;
IYI, N .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1987, 26 (12) :L2076-L2079