Contrasting Magnetic Behaviors in Rhodium- and Ruthenium-Doped Cubic Perovskite SrFeO3 : Nearly Ferromagnetic Metal versus Spin-Glass Insulator

Masataka Kinoshita; Hideaki Sakai; Naoaki Hayashi; Yoshinori Tokura; Mikio Takano; Shintaro Ishiwata

doi:10.1002/anie.201608222

Contrasting Magnetic Behaviors in Rhodium- and Ruthenium-Doped Cubic Perovskite SrFeO₃ : Nearly Ferromagnetic Metal versus Spin-Glass Insulator

Angew Chem Int Ed Engl. 2016 Dec 5;55(49):15292-15296. doi: 10.1002/anie.201608222. Epub 2016 Nov 2.

Authors

Masataka Kinoshita¹, Hideaki Sakai^{1

2}, Naoaki Hayashi^{3

4

5}, Yoshinori Tokura^{1

6}, Mikio Takano^{3

4

5}, Shintaro Ishiwata^{1

7}

Affiliations

¹ Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo, 113-8656, Japan.
² Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043, Japan.
³ Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan.
⁴ Research Institute for Production Development, Shimogamo-morimoto, Sakyo, Kyoto, 606-0805, Japan.
⁵ CREST Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan.
⁶ RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
⁷ PRESTO Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan.

PMID: 27805780
DOI: 10.1002/anie.201608222

Abstract

The effects of Rh and Ru doping for SrFeO₃ , a helimagnetic metal with a cubic perovskite structure, are studied by magnetic and resistivity measurements. Although SrRhO₃ is a paramagnetic metal and SrRuO₃ is a ferromagnetic one, the Rh doping induces a nearly ferromagnetic metallic state, whereas the Ru doping induces a spin-glass insulating state. Mössbauer measurements evidence a marked difference between SrFe_0.8 Rh_0.2 O₃ and SrFe_0.8 Ru_0.2 O₃ in the formal valences of Fe, which are estimated to be 4+ and 3.75+, respectively. The contrasting magnetic behaviors of Rh- and Ru-doped SrFeO₃ are discussed in terms of the subtle balance between the double-exchange ferromagnetism and the superexchange antiferromagnetism.

Keywords: ferromagnetism; high-pressure synthesis; magnetic properties; perovskite phases; unusually high valence ions.

Publication types

Research Support, Non-U.S. Gov't