title: Collapse of valence transition in Yb0.8Y0.2InCu4: pressure-induced weak ferromagnetism.
abstract: We investigated the magnetization of Yb0.8Y0.2InCu4 as a function of temperature down to 0.6 K, pressure up to 1.2 GPa, and magnetic field up to 9 T. The valence transition temperature of Yb0.8Y0.2InCu4 is lowered with applying pressure. At 0.8 GPa, collapse of the valence transition and ferromagnetic ordering occur almost simultaneously. The ferromagnetic phase at 1.2 GPa is characterized by a low Curie temperature of 1.7 K and an extremely small ordered moment of 0.05 micro(B) per Yb. Some effect of screening the ordered moment may play a key role in the ferromagnetism and the valence transition.
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. a3da@sci.toyama-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Mitsuda
authors.forename: T
authors.initials: T
authors.lastname: Goto
authors.forename: K
authors.initials: K
authors.lastname: Yoshimura
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: N
authors.initials: N
authors.lastname: Sato
authors.forename: K
authors.initials: K
authors.lastname: Kosuge
authors.forename: H
authors.initials: H
authors.lastname: Wada