title: Direct synthesis of chromium perovskite oxyhydride with a high magnetic-transition temperature.
abstract: We report a novel oxyhydride SrCrO2H directly synthesized by a high-pressure high-temperature method. Powder neutron and synchrotron X-ray diffraction revealed that this compound adopts the ideal cubic perovskite structure (Pm3̄m) with O(2-)/H(-) disorder. Surprisingly, despite the non-bonding nature between Cr 3d t(2g) orbitals and the H 1s orbital, it exhibits G-type spin ordering at T(N)≈380 K, which is higher than that of RCrO3 (R=rare earth) and any chromium oxides. The enhanced T(N) in SrCrO2H with four Cr-O-Cr bonds in comparison with RCr(3+)O3 with six Cr-O-Cr bonds is reasonably explained by the tolerance factor. The present result offers an effective strategy to tune octahedral tilting in perovskites and to improve physical and chemical properties through mixed anion chemistry.
authors.affiliation: Graduate School of Engineering, Kyoto University, Kyoto 615-8510 (Japan); The Hakubi Center for Advanced Research, Kyoto University, Kyoto (Japan).
authors.forename: Cédric
authors.initials: C
authors.lastname: Tassel
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Goto
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kuno
authors.forename: James
authors.initials: J
authors.lastname: Hester
authors.forename: Mark
authors.initials: M
authors.lastname: Green
authors.forename: Yoji
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
keywords: chromium; high-pressure chemistry; mixed anion phases; oxyhydrides; perovskites