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Crystal growth of YBa2Cu4O8 and Y2Ba4Cu7O15 under high oxygen pressure

  • Takayuki Miyatake (a1), Tsutomu Takata (a1), Koji Yamaguhi (a1), Kenshi Takamuku (a1), Naoki Koshizuka (a1), Shoji Tanaka (a1), Kazuyuki Shibutani (a2), Seiji Hayashi (a2), Rikuo Ogawa (a2) and Yoshio Kawate (a2)...

Abstract

We investigate the crystal growth of YBa2Cu4O8 and Y2Ba4Cu7C7O15−σ in Al2O3 crucibles at P(O2) = 20 MPa employing commercial O2-HIP equipment. Large crystals of YBa2Cu4O8 up to 1 × 0.5 × 0.05 mm3 are obtained from starting compositions of about 65–67 mol % CuO. When we use a composition of Y: Ba: Cu = 2:6:15, single crystals of YBa2Cu4O8, free from contamination, are obtained at a growth temperature of 1000°C, and those of the Y2Ba4Cu7O15 phase with Al, having the maximum size of 3 × 1.5 × 0.05 mm3, are obtained at a temperature of 1050°C. YBa2Cu4O8 crystals exhibit a superconducting transition temperature Tc of 75 K. Y2Ba4Cu7O15−σ crystals have a Tc of 20 K because of the contamination of aluminum from the crucible.

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Crystal growth of YBa2Cu4O8 and Y2Ba4Cu7O15 under high oxygen pressure

  • Takayuki Miyatake (a1), Tsutomu Takata (a1), Koji Yamaguhi (a1), Kenshi Takamuku (a1), Naoki Koshizuka (a1), Shoji Tanaka (a1), Kazuyuki Shibutani (a2), Seiji Hayashi (a2), Rikuo Ogawa (a2) and Yoshio Kawate (a2)...

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