1998 年 25 巻 3 号 p. A123-
Liquidus composition of the Y_2Cu_2O_5 was confirmed by in-situ method under a high temperature optical microscop. With this result. Y_2Cu_2O_5 single crystals were successfully grown by the TSFZ method. This crystal showed antiferromagnetic transition below 13K and metamagnetic behavior which two magnetization steps were observed.