Physics – Condensed Matter – Superconductivity
Scientific paper
2009-01-22
Physics
Condensed Matter
Superconductivity
16 pages, 5 figures + 1 table,
Scientific paper
We have grown underdoped (x = 0.11, 0.12) and optimally doped (x = 0.16) La2-xSrxCuO4 (LSCO) crystals by traveling-solvent floating-zone (TSFZ) technique. In order to obtain LSCO single crystals of high quality, we have made much effort to optimize the preparation procedures. For example, we have adopted sol-gel route to prepare highly fine and homogeneous LSCO precursor powder, and used quite slow growth rate. The sizable grown crystal ingots are typically about 6.6 mm in diameter and 100 mm in length, and no impurity phases were detected. The high quality of grown crystals has been verified by double-crystal x-ray rocking curves, with full-width-at-half-maximum (FWHM) being only 113 ~ 150 arcseconds (or 0.03 deg - 0.04 deg), which are the best data reported so far for LSCO crystals. The superconducting critical temperatures (TC's) of the cuprate crystals are 30 K for x = 0.11, 31 K for x = 0.12 and 38.5 K for x = 0.16 samples according to magnetic measurements.
Dong Xiaoli
Li Zhengcai
Lu Wei
Shen Caixia
Shen Xiaoli
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