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 journalArticlepeer-review

45 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 languageEnglish (US)
Pages (from-to)1501-1507
Number of pages7
JournalInorganic Chemistry
Volume54
Issue number4
DOIs
StatePublished - Feb 16 2015
Externally publishedYes

Bibliographical note

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

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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