SUPERCONDUCTIVITY AND MICROSTRUCTURE OF N-TYPE LN1.85CE0.15CUO4-Y (LN=PR, SM, EU) PRODUCED UNDER HIGH-PRESSURE SINTERING

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	SUPERCONDUCTIVITY AND MICROSTRUCTURE OF N-TYPE LN1.85CE0.15CUO4-Y (LN=PR, SM, EU) PRODUCED UNDER HIGH-PRESSURE SINTERING
	C. Q. Jin; Y. S. Yao; S. C. Liu; W. L. Zhou; W. K. Wang
	1993
发表期刊	Applied Physics Letters
ISSN	0003-6951
卷号	62 期号:23 页码:3037-3039
摘要	Using an unconventional reduction method, high-pressure sintering at 6.0 GPa and about 600-degrees-C for 20 min, we have produced high-quality n-type Ln1.85Ce0.15CUO4-y (Ln = Pr, Sm, and Eu) superconductors from the as-prepared materials. The samples show higher critical temperatures, higher superconducting phase fractions, and much lower resistances in the normal state than those synthesized by conventional methods. The increase of critical temperature in Eu1.85Ce0.15CUO4-y is Most obvious with an onset temperature T(c)on and zero-resistance temperature T(c)0 of 28.4 and 23.3 K, respectively. High-pressure sintering seems to be effective on the modulation of the fine crystal and electronic structures of n-type systems. In particular, metallic resistance versus temperature behaviors in normal states similar to those found in single crystals and epitaxial films are observed in Sm1.85Ce0.15CUO4-y and Eu1.85Ce0.15CUO4-y, in sharp contrast to the semiconductorlike behaviors in the conventionally prepared samples. From transmission electron microscopy studies, it is found that the compacting and regrowth of the polycrystal under high-pressure sintering greatly improves the weak links at grain boundaries.
部门归属	chinese acad sci,inst phys,beijing 100080,peoples r china. acad sinica,int ctr mat phys,shenyang 110015,peoples r china.;jin, cq (reprint author), ccast,world lab,pob 8730,beijing 100080,peoples r china
关键词	High-temperature Superconductivity Normal-state Nd2-xcexcuo4-y Resistivity Crystals Growth Th
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/39045
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Q. Jin,Y. S. Yao,S. C. Liu,et al. SUPERCONDUCTIVITY AND MICROSTRUCTURE OF N-TYPE LN1.85CE0.15CUO4-Y (LN=PR, SM, EU) PRODUCED UNDER HIGH-PRESSURE SINTERING[J]. Applied Physics Letters,1993,62(23):3037-3039.
APA	C. Q. Jin,Y. S. Yao,S. C. Liu,W. L. Zhou,&W. K. Wang.(1993).SUPERCONDUCTIVITY AND MICROSTRUCTURE OF N-TYPE LN1.85CE0.15CUO4-Y (LN=PR, SM, EU) PRODUCED UNDER HIGH-PRESSURE SINTERING.Applied Physics Letters,62(23),3037-3039.
MLA	C. Q. Jin,et al."SUPERCONDUCTIVITY AND MICROSTRUCTURE OF N-TYPE LN1.85CE0.15CUO4-Y (LN=PR, SM, EU) PRODUCED UNDER HIGH-PRESSURE SINTERING".Applied Physics Letters 62.23(1993):3037-3039.