An Antiferro-to-Ferromagnetic Transition in EuTiO sub(3-x)H sub(x) Induced by Hydride Substitution
We have prepared the oxyhydride perovskite EuTiO sub(3-x)H sub(x) (x [< or =] 0.3) by a low temperature CaH sub(2) reduction of pyrochlore Eu sub(2)Ti sub(2)O sub(7) and perovskite EuTiO sub(3). The reduced EuTiO sub(3-x)H sub(x) crystallizes in the ideal cubic perovskite (Pm3m), where O/H anions...
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| Veröffentlicht in: | Inorganic chemistry 2015-02, Vol.54 (4), p.1501-1507 |
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| container_title | Inorganic chemistry |
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| creator | Yamamoto, Takafumi Yoshii, Ryuta Bouilly, Guillaume Kobayashi, Yoji Fujita, Koji Kususe, Yoshiro Matsushita, Yoshitaka Tanaka, Katsuhisa Kageyama, Hiroshi |
| description | We have prepared the oxyhydride perovskite EuTiO sub(3-x)H sub(x) (x [< or =] 0.3) by a low temperature CaH sub(2) reduction of pyrochlore Eu sub(2)Ti sub(2)O sub(7) and perovskite EuTiO sub(3). The reduced EuTiO sub(3-x)H sub(x) 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 EuTiO sub(3-x)H sub(x) 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 T sub(C) of 12 K is higher than those of any other EuTiO sub(3)-derived ferromagnets. The ferromagnetism can be explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu super(2+) 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. |
| doi_str_mv | 10.1021/ic502486e |
| format | Article |
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The reduced EuTiO sub(3-x)H sub(x) 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 EuTiO sub(3-x)H sub(x) 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 T sub(C) of 12 K is higher than those of any other EuTiO sub(3)-derived ferromagnets. The ferromagnetism can be explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu super(2+) spins mediated by the itinerant Ti 3d electrons. 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The reduced EuTiO sub(3-x)H sub(x) 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 EuTiO sub(3-x)H sub(x) 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 T sub(C) of 12 K is higher than those of any other EuTiO sub(3)-derived ferromagnets. The ferromagnetism can be explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu super(2+) spins mediated by the itinerant Ti 3d electrons. 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The reduced EuTiO sub(3-x)H sub(x) 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 EuTiO sub(3-x)H sub(x) 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 T sub(C) of 12 K is higher than those of any other EuTiO sub(3)-derived ferromagnets. The ferromagnetism can be explained by the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu super(2+) 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><doi>10.1021/ic502486e</doi></addata></record> |
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| source | American Chemical Society Publications |
| subjects | Anions Doping Ferromagnetism Hydrides Perovskites Reduction Temperature dependence Three dimensional |
| title | An Antiferro-to-Ferromagnetic Transition in EuTiO sub(3-x)H sub(x) Induced by Hydride Substitution |
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