Room-temperature ferrimagnetism of anti-site-disordered C a2MnOs O6

Hai L. Feng, Madhav Prasad Ghimire, Zhiwei Hu, Sheng Chieh Liao, Stefano Agrestini, Jie Chen, Yahua Yuan, Yoshitaka Matsushita, Yoshihiro Tsujimoto, Yoshio Katsuya, Masahiko Tanaka, Hong Ji Lin, Chien Te Chen, Shih Chang Weng, Manuel Valvidares, Kai Chen, Francois Baudelet, Arata Tanaka, Martha Greenblatt, Liu Hao TjengKazunari Yamaura

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Abstract

Room-temperature ferrimagnetism was discovered for the anti-site-disordered perovskite Ca2MnOsO6 with Tc=305K. Ca2MnOsO6 crystallizes into an orthorhombic structure with a space group of Pnma, in which Mn and Os share the oxygen-coordinated-octahedral site at an equal ratio without a noticeable ordered arrangement. The material is electrically semiconducting with variable-range-hopping behavior. X-ray absorption spectroscopy confirmed the trivalent state of the Mn and the pentavalent state of the Os. X-ray magnetic circular dichroism spectroscopy reveals that the Mn and Os magnetic moments are aligned antiferromagnetically, thereby classifying the material as a ferrimagnet which is in accordance with band structure calculations. It is intriguing that the magnetic signal of the Os is very weak, and that the observed total magnetic moment is primarily due to the Mn. The Tc=305K is the second highest in the material category of so-called disordered ferromagnets such as CaRu1-xMnxO3, SrRu1-xCrxO3, and CaIr1-xMnxO3, and hence, may support the development of spintronic oxides with relaxed requirements concerning the anti-site disorder of the magnetic ions.

Original languageEnglish (US)
Article number124404
JournalPhysical Review Materials
Volume3
Issue number12
DOIs
StatePublished - Dec 16 2019

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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