Floating-zone growth and property characterizations of high-quality La2-xSrxCuO4 superconductor crystals

doi:10.1088/1674-1056/18/7/045

Abstract

Abstract We have grown underdoped (x = 0.11, 0.12) and optimally doped (x = 0.16) La_2-xSr_xCuO₄ single crystals by the traveling-solvent floating-zone technique. In order to prepare good quality cuprate crystals, we have made much effort to optimize the preparation procedures. For example, we haveadopted the sol--gel route to prepare a highly fine and homogeneous La_2-xSr_xCuO₄ precursor powder for fabricating a very dense ceramic feed rod used for the floating-zone growth, and we have also used quite a slow growth rate. The high quality of the grown crystals has been verified by double-crystal x-ray rocking curves, with the full-width-at-half-maximum being only 113--150 arcseconds, which are the best data reported so far for La_2-xSr_xCuO₄ crystals. The superconducting critical temperatures of the grown crystals are 30, 31 and 38.5 K for x = 0.11, 0.12 and 0.16 samples, respectively, according to magnetic measurements.

Keywords: floating-zone crystal growth sol--gel chemistry x-ray rocking curves superconductivity

Received: 08 April 2009
Revised: 08 April 2009
Accepted manuscript online:

PACS:	81.10.Fq	(Growth from melts; zone melting and refining)
	74.72.Dn
	81.20.Fw	(Sol-gel processing, precipitation)
	74.62.-c	(Transition temperature variations, phase diagrams)
	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	61.05.cp	(X-ray diffraction)

Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No 2006CB0L0302) and the National Natural Science Foundation of China (Grant No 10574149).

Cite this article:

Shen Xiao-Li(慎晓丽), Li Zheng-Cai(李正才), Shen Cai-Xia(申彩霞), Lu Wei(陆伟), Dong Xiao-Li(董晓莉), Zhou Fang(周放), and Zhao Zhong-Xian(赵忠贤) Floating-zone growth and property characterizations of high-quality La_2-xSr_xCuO₄ superconductor crystals 2009 Chin. Phys. B 18 2893

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Floating-zone growth and property characterizations of high-quality La2-xSrxCuO4 superconductor crystals

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Floating-zone growth and property characterizations of high-quality La_2-xSr_xCuO₄ superconductor crystals