Single crystal growth of superconducting La2−xMxCuO4 (MCa, Sr, Ba) by the TSFZ method

Kojima, H.; Yamamoto, Junichi; Mori, Yoshihiro; Khan, M.K.R.; Tanabe, Hideyoshi; Tanaka, Isao

doi:10.1016/s0921-4534(97)01500-1

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…The Ce concentration varies slightly among crystals from the same batch and was determined individually for each crystal by quantitative wavelength dispersive electron microprobe analysis (WDX).The Ce concentration in the a-b plane of each crystal was found to be constant within experimental resolution of ∆x=±0.01. Sometimes the nominal composition of the feed rod may be very different from that of the as-grown single crystals, for example, the doped concentration difference between the feed rod and the as-grown single crystals is big in La 2-x Ba x CuO 4 single crystals when Ba content increases beyond 0.1 [11]. For Nd 2-x Ce x CuO 4-y single crystals, the difference of them is very small, shown in Fig.2.…”

Section: Resultsmentioning

confidence: 99%

Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Jia¹,

Chen²,

Yang³

et al. 2004

Cryst. Res. Technol.

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Nd2‐xCexCuO4‐y single crystals with different x values have been successfully grown by Traveling Solvent Floating Zone method (TSFZ). Electronic properties of Nd2‐xCexCuO4‐y single crystals with various x have been studied in detail. The results show that superconductivity can be found in crystals with x > 0.1 (0.13‐0.18) directly grown at oxygen‐reduced atmosphere without post‐annealed, while no superconductivity appears in crystals with x < 0.1 at the same atmosphere. It is also found that, the segregation coefficient of Ce is determined to be 0.946 and transition temperature Tc (onset) reaches maximum value of 23.5 K at nominal composition x = 0.165. With further increase of Ce concentration, transition temperature of single crystals declines due to the precipitation of secondary Phases. In addition, the variation of lattice constants of Nd2‐xCexCuO4‐y single crystals with different x is also given. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 99%

Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Jia¹,

Chen²,

Yang³

et al. 2004

Cryst. Res. Technol.

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“…For the solvents, the composition of staring materials was much richer in CuO as self-flux, which was typically of 78 mol% in content. In determining the Sr contents of the solvents corresponding to the various Sr doping levels of present interest, we took into account the previously reported results of distribution coefficients k Sr of Sr doping into La 2 CuO 4 [14]. After ground and mixed the starting mixtures were prefired in air at 970 °C for 15 hours, they were then ground and mixed again before pressed into pellets of about 700 mg.…”

Section: Methodsmentioning

confidence: 99%

Anomalous superconducting properties at magic doping levels in under-doped La2−xSrxCuO4 single crystals

Zhou¹,

Hor²,

Dong³

et al. 2004

Physica C: Superconductivity

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A series of high-quality under-doped La 2-x Sr x CuO 4 superconductor crystals with x = 0.063 ~ 0.125 were prepared by traveling-solvent floating-zone (TSFZ) technique. We found by dc magnetic measurements that, in this series of crystals, the superconducting transition was quite sharp in the vicinity of the hole densities of x = 1/16 and x = 1/9 while it was much broader away from these two 'magic numbers', and the Meissner fraction showed a remarkable minimum near x = 1/9. We concluded that these phenomena are reflections of intrinsic properties of this cuprate system. Our observations are discussed in light of recently proposed composite charge model together with charge inhomogeneity and electronic phase separations.

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“…LSCO system is therefore not only attractive in its possible applications but also in such fundamental research. For both purposes, highquality and sizeable single crystals are highly demanded, and persistent effort has been made in the crystal growth using different techniques [7][8][9][10][11][12]. The travelling-solvent floatingzone (TSFZ) method is widely accepted as a unique approach to growing such incongruent melting oxide superconductor crystals.…”

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confidence: 99%

Under-doped La_2 xSr_xCuO₄withx 0.063 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties

Zhou¹,

Ti²,

Xiong³

et al. 2003

Supercond. Sci. Technol.

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to be published on Superconductor Science and TechnologyA 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 ionbeam 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. PACS Number: 74.72.Dn; 74.25.Ha.

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Single crystal growth of superconducting La2−xMxCuO4 (MCa, Sr, Ba) by the TSFZ method

Cited by 16 publications

References 5 publications

Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Anomalous superconducting properties at magic doping levels in under-doped La2−xSrxCuO4 single crystals

Under-doped La_2 xSr_xCuO₄withx 0.063 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties

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Single crystal growth of superconducting La2−xMxCuO4 (MCa, Sr, Ba) by the TSFZ method

Cited by 16 publications

References 5 publications

Growth and characterization of superconductive Nd2‐xCexCuO4‐y single crystals

Growth and characterization of superconductive Nd2‐xCexCuO4‐y single crystals

Anomalous superconducting properties at magic doping levels in under-doped La2−xSrxCuO4 single crystals

Under-doped La2 xSrxCuO4withx 0.063 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties

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Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Growth and characterization of superconductive Nd_2‐xCe_xCuO_4‐y single crystals

Under-doped La_2 xSr_xCuO₄withx 0.063 0.125: TSFZ growth of high-quality crystals and anomalous doping dependences of superconducting properties