Simple One-Step Synthesis and Superconducting Properties of SmFeAsO1-xFx

	Simple One-Step Synthesis and Superconducting Properties of SmFeAsO1-xFx
	Ma YW(马衍伟)
刊名	CHINESE PHYSICS LETTERS
	2009
通讯作者	马衍伟
中文摘要	The recent discovery of superconductivity in REFeAsO (RE, rare-earth metal) has generated enormous interest because these materials are the first non-copper oxide superconductors with critical temperatures T-c exceeding 50 K as well as upper critical fields well above 100 T. However, for these new superconductors, very complicated synthesis routes, such as the complex two-step synthesis or high-pressure sintering, are required. Furthermore, there is the toxicity and volatility of arsenic to consider, sometimes a sealed quartz tube of arsenic exploded during annealing. We present a new method for producing high-temperature SmFeAsO1-xFx superconductors by using a one-step sintering process. Superconducting transition with the onset temperature of 54.6 K and high critical fields H-c2(0) >= 200 T were confirmed in SmFeAsO0.7F0.3. At 5K and at self field, critical current densities J(c) estimated from the magnetization hysteresis using the whole sample size and the average particle size have reached 8.5 x 10(3) and 1.2 x 10(6) A/cm(2), respectively. Moreover, J(c) exhibited a very weak dependence on magnetic field. This simple and safe one-step synthesis technique should be effective in other rare earth derivatives of iron-based superconductors.
学科主题	材料合成与加工工艺
收录类别	1
公开日期	2010-09-29
附注	The recent discovery of superconductivity in REFeAsO (RE, rare-earth metal) has generated enormous interest because these materials are the first non-copper oxide superconductors with critical temperatures T-c exceeding 50 K as well as upper critical fields well above 100 T. However, for these new superconductors, very complicated synthesis routes, such as the complex two-step synthesis or high-pressure sintering, are required. Furthermore, there is the toxicity and volatility of arsenic to consider, sometimes a sealed quartz tube of arsenic exploded during annealing. We present a new method for producing high-temperature SmFeAsO1-xFx superconductors by using a one-step sintering process. Superconducting transition with the onset temperature of 54.6 K and high critical fields H-c2(0) >= 200 T were confirmed in SmFeAsO0.7F0.3. At 5K and at self field, critical current densities J(c) estimated from the magnetization hysteresis using the whole sample size and the average particle size have reached 8.5 x 10(3) and 1.2 x 10(6) A/cm(2), respectively. Moreover, J(c) exhibited a very weak dependence on magnetic field. This simple and safe one-step synthesis technique should be effective in other rare earth derivatives of iron-based superconductors.
内容类型	期刊论文
源URL	[http://ir.iee.ac.cn/handle/311042/307]
专题	电工研究所_超导材料及强磁场科学研究组_超导材料及强磁场科学研究组_期刊论文
推荐引用方式 GB/T 7714	Ma YW. Simple One-Step Synthesis and Superconducting Properties of SmFeAsO1-xFx[J]. CHINESE PHYSICS LETTERS,2009.
APA	马衍伟.(2009).Simple One-Step Synthesis and Superconducting Properties of SmFeAsO1-xFx.CHINESE PHYSICS LETTERS.
MLA	马衍伟."Simple One-Step Synthesis and Superconducting Properties of SmFeAsO1-xFx".CHINESE PHYSICS LETTERS (2009).