Synthesis and structure of rutheno-cuprate (RE, Ce)2Sr2RuCu2O10−δ (RE = Gd, Eu) single crystals

Yamaki, Kazuhiro; Mochiku, Takashi; Matsushita, Yoshitaka; Kitamura, Michihide; Irie, Atsushi

doi:10.1016/j.physc.2019.03.007

Cited by 3 publications

(1 citation statement)

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“…Recently, our group has been investigating the singlecrystal growth of ruthenocuprates by a simple method using an alumina crucible. [34][35][36][37][38][39] As part of this research, we successfully synthesized both a 100 μm cubic RuGd-1212 single crystal and a 100 μm plate-like RuGd-1222 single crystal 36,39) and observed an onset transition temperature (T c-onset ) of 23.0 K and a zero-resistance superconducting transition temperature (T c-zero ) of 6.2 K for the RuGd-1212 single crystal. 37) Furthermore, single-crystal X-ray diffraction (XRD) results indicated that disappearance of the superconductivity in RuGd-1212 single crystals could be attributed to the substitution of Ru in the CuO 2 planes and Gd at Sr sites.…”

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confidence: 99%

Bulk superconductivity in RuGd-1212 single crystals

Funahashi

Mochiku

Matsushita

et al. 2020

Jpn. J. Appl. Phys.

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The occurrence of bulk superconductivity in the magnetosuperconductor GdSr2RuCu2O8−δ (RuGd-1212) remains controversial. Recently, we have successfully grown single crystals of RuGd-1212 with a size of 100 μm by partial melting. Although most single crystals prepared by conventional methods do not exhibit superconductivity, the superconductivity could be improved optimizing the synthetic conditions, and subtle changes in the sintering temperature were found to influence the emergence of superconductivity. Although most of the superconducting samples contained a small amount of the impurity phase Sr2GdRuO6, superconducting RuGd-1212 single crystals were the predominant phase. Furthermore, we successfully observed an onset transition temperature (Tc-onset) of 30 K and an in-plane critical current (Ic) of 12 mA. These experimental results indicate that the obtained RuGd-1212 single crystals exhibited bulk superconductivity.

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