Floating-zone growth and property characterizations of high-quality La2-хSrхCuO4 superconductor crystals

We have grown underdoped(x=0.11,0.12) and optimally doped(x=0.16) La2 x SrxCuO4 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 La2xSrxCuO4 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 La2xSrxCuO4 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.

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

We have grown underdoped (x = 0.11, 0.12) and optimally doped (x= 0.16) La_2-xSr_xCuO₄ single crystals by thetraveling-solvent floating-zone technique. In order to prepare good qualitycuprate crystals, we have made much effort to optimize the preparation procedures.For example, we haveadopted the sol--gel route to prepare a highlyfine and homogeneous La_2-xSr_xCuO₄ precursor powder for fabricating a very denseceramic feed rod used for the floating-zone growth, and we have also usedquite a slow growth rate. The high quality of the grown crystalshas been verified by double-crystal x-ray rocking curves, with thefull-width-at-half-maximum being only 113--150 arcseconds, which arethe best data reported so far for La_2-xSr_xCuO₄crystals. The superconducting critical temperatures of the growncrystals are 30, 31 and 38.5~K for x = 0.11, 0.12 and 0.16samples, respectively, according to magnetic measurements.