An antiferro-to-ferromagnetic transition in EuTiO3-xHx induced by hydride substitution

Takafumi Yamamoto; Ryuta Yoshii; Guillaume Bouilly; Yoji Kobayashi; Koji Fujita; Yoshiro Kususe; Yoshitaka Matsushita; Katsuhisa Tanaka; Hiroshi Kageyama

doi:10.1021/ic502486e

An antiferro-to-ferromagnetic transition in EuTiO3-xHx induced by hydride substitution

Takafumi Yamamoto, Ryuta Yoshii, Guillaume Bouilly, Yoji Kobayashi, Koji Fujita, Yoshiro Kususe, Yoshitaka Matsushita, Katsuhisa Tanaka, Hiroshi Kageyama

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

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 (Pm3¯m), 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.

Original language	English (US)
Pages (from-to)	1501-1507
Number of pages	7
Journal	Inorganic Chemistry
Volume	54
Issue number	4
DOIs	https://doi.org/10.1021/ic502486e
State	Published - Feb 16 2015
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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10.1021/ic502486e

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title = "An antiferro-to-ferromagnetic transition in EuTiO3-xHx induced by hydride substitution",

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 (Pm3¯m), 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.",

author = "Takafumi Yamamoto and Ryuta Yoshii and Guillaume Bouilly and Yoji Kobayashi and Koji Fujita and Yoshiro Kususe and Yoshitaka Matsushita and Katsuhisa Tanaka and Hiroshi Kageyama",

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T1 - An antiferro-to-ferromagnetic transition in EuTiO3-xHx induced by hydride substitution

AU - Yamamoto, Takafumi

AU - Yoshii, Ryuta

AU - Bouilly, Guillaume

AU - Kobayashi, Yoji

AU - Fujita, Koji

AU - Kususe, Yoshiro

AU - Matsushita, Yoshitaka

AU - Tanaka, Katsuhisa

AU - Kageyama, Hiroshi

N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13

PY - 2015/2/16

Y1 - 2015/2/16

N2 - 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 (Pm3¯m), 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.

AB - 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 (Pm3¯m), 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.

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JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 4

ER -

An antiferro-to-ferromagnetic transition in EuTiO3-xHx induced by hydride substitution

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