1. An Antiferro-to-Ferromagnetic Transition in EuTiO3-xHx Induced by Hydride Substitution.
- Author
-
Takafumi Yamamoto, Ryuta Yoshii, Guillaume Bouilly, Yoji Kobayashi, Koji Fujita, Yoshiro Kususe, Yoshitaka Matsushita, Katsuhisa Tanaka, and Hiroshi Kageyama
- Subjects
- *
FERROMAGNETIC materials synthesis , *PEROVSKITE synthesis , *TITANIUM oxides synthesis , *MAGNETIC transitions , *EUROPIUM compounds synthesis , *HYDRIDES , *SUBSTITUTION reactions - Abstract
We have prepared the oxyhydride perovskite EuTiO3-xHx (x ∀ 0.3) by a low temperature CaH2 reduction of pyrochlore Eu2Ti2O7 and perovskite EuTiO3. The reduced EuTiO3-xHx crystallizes in the ideal cubic perovskite (Pm3m), where O/H anions are randomly distributed. As a result of electron doping by the aliovalent anion exchange, the resistivity of EuTiO3-xHx shows metallic temperature dependence. Moreover, an antiferromagnetic-to-ferromagnetic transition is observed even when a small amount of hydride (x ~0.07) is introduced. The Curie temperature TC of 12 K is higher than those of any other EuTiO3-derived ferromagnets. The ferromagnetism can be explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu2+ spins mediated by the itinerant Ti 3d electrons. The present study shows that controlling the oxide/hydride ratio is a versatile method to tune magnetic and transport properties. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF