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Under-doped La2-xSrxCuO4 with x = 0.063 - 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties

F Zhou·W X Ti·J W Xiong·Z X Zhao X L Dong·P H Hor·Z H Zhang·W K Chu
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Abstract

A series of high-quality La2-xSrxCuO4 (LSCO) superconductor crystals in the under-doping region with x = 0.063, 0.07, 0.09, 0.10, 0.111 and 0.125 has been successfully prepared by traveling-solvent floating-zone (TSFZ) technique. The crystals are large and free of sub-grains and foreign phases. The high crystal quality has been revealed by double-crystal x-ray rocking curves and Rutherford backscattering spectrometry combined with ion-beam channeling effect. We find that the evolutions of the superconducting transition width and volume fraction as a function of carrier concentration exhibit interesting anomalies in the vicinity of some magic number doping levels such as x =1/4^2 (=0.0625) and 1/3^2 (=0.111). We argue that these behaviours are of intrinsic electronic origin.

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F Zhou, W X Ti, J W Xiong, Z X Zhao X L Dong, P H Hor, Z H Zhang, W K Chu. 2002-12-12. Under-doped La2-xSrxCuO4 with x = 0.063 - 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties. https://doi.org/10.1088/0953-2048%2F16%2F3%2F101

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