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Magnetic field effects on synthesis process of high-Tc superconductors
S.Awaji,Y.Ma,W.P.Chen,H.Maeda,K.Watanabe,M.Motokawa 한국물리학회 2003 Current Applied Physics Vol.3 No.5
Materials synthesis processes in high magnetic fields are investigated for high-Tc superconductors at the High Field Laboratoryfor Superconducting Materials, Institute for Materials Research, Tohoku University. On a melt growth process of YBa2Cu3O7 bulkalso the decrease of the crystal growth rate by the magnetic field, which is suggested from a dierential temperature analysismeasurement in magnetic fields. On a chemical vapor deposition process of YBa2Cu3O7 lms deposited on the polycrystalline Agsubstrates in high magnetic elds, the microstructure changes drastically from the rectangular large grains with 10l m in size to thesmall complex shaped grains. The spiral growth mode is observed for the samples prepared at 0 T but it changes into the island2Sr2CaCu2O8 tapes in magneticelds, the homogeneous texture is obtained and it results in the increase of the critical current density.. 2003 Elsevier B.V.