Abstract
We investigate the single crystal growth of rutheno-cuprates, which are known to be magnetic superconductors. We attempted the single crystal growth of two systems, RuSr2GdCu2O8−δ (RuGd-1212) and RuSr2(Gd,Ce)2Cu2O10−δ (RuGd-1222), by the self-flux method with alumina boats. Fine cubic crystals of RuGd-1212 with a side length of approximately 5 μ m were obtained by slow cooling from 1350 to 940 ∘C. Plate-like RuGd-1222 crystals with a smooth plane were obtained at the surface of the precursor pellet. RuGd-1222 was more stable at high temperatures than RuGd-1212 and was also superconductive, but its superconductivity weakened as the cooling rate decreased. This weakening was induced by decomposition. Therefore, high-quality RuGd-1222 single crystals were difficult to obtain, and we failed to extract only the smooth planar crystal part. As a modified synthesis technique, we mixed a precursor containing Ru–Sr–Gd–Ce flux with RuGd-1222 powders and gradually cooled the mixture from 1350 to 1090 ∘C. A plate-like RuGd-1222 sample with a smooth surface and a size of 70 × 30μm2 was obtained from the side surface of the precursor pellet. By this technique, we could separate the planar crystal part. Semiquantitative composition analysis confirmed this planar crystal as a RuGd-1222 phase. The X-ray diffraction peak suggested the (0014) plane, implying that the plate-like precipitates are c-axis-oriented RuGd-1222 single crystals.
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Acknowledgments
This study was partially supported by a Grant-in-Aid for Scientific Research (Grant No. 18K04921) from the Japan Society for the Promotion of Science (JSPS) and the Casio Science Promotion Foundation.
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Yamaki, K., Bamba, Y. & Irie, A. Preparation of Fine Single Crystals of Rutheno-Cuprates by the Self-Flux Method with Alumina Boats. J Supercond Nov Magn 32, 1171–1177 (2019). https://doi.org/10.1007/s10948-018-4803-8
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DOI: https://doi.org/10.1007/s10948-018-4803-8