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  Enhanced magnetization of the highest-T-C ferrimagnetic oxide Sr2CrOsO6

Chen, J., Wang, X., Hu, Z., Tjeng, L. H., Agrestini, S., Valvidares, M., et al. (2020). Enhanced magnetization of the highest-T-C ferrimagnetic oxide Sr2CrOsO6. Physical Review B, 102(18): 184418, pp. 1-13. doi:10.1103/PhysRevB.102.184418.

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Chen, Jie1, Author
Wang, Xiao2, Author              
Hu, Zhiwei3, Author              
Tjeng, Liu Hao4, Author              
Agrestini, Stefano1, Author
Valvidares, Manuel1, Author
Chen, Kai1, Author
Nataf, Lucie1, Author
Baudelet, Francois1, Author
Nagao, Masahiro1, Author
Inaguma, Yoshiyuki1, Author
Belik, Alexei A.1, Author
Tsujimoto, Yoshihiro1, Author
Matsushita, Yoshitaka1, Author
Kolodiazhnyi, Taras1, Author
Sereika, Raimundas1, Author
Tanaka, Masahiko1, Author
Yamaura, Kazunari1, Author
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
4Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              


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 Abstract: The double perovskite oxide Sr2CrOsO6 with a 3d(3)-5d(3) configuration exhibits very high-T-C ferrimagnetism (similar to 725 K) at the end point of half-metallicity. Many substitution studies have been conducted theoretically and experimentally over the last two decades to shed more light on the open issue of how the 3d(3)-5d(3) configuration generates the high-T-C ferrimagnetic state and to accelerate development toward applications. We have succeeded in synthesizing a solid solution of Sr2Cr1-xNixOsO6 under high-pressure and high-temperature conditions. Sr2Cr0.5Ni0.5OsO6 exhibits magnetization sixfold greater (similar to 1.2 mu(B)/formula unit at 5 K) than that of Sr2CrOsO6. This enhancement is preserved even at room temperature. X-ray absorption spectroscopy revealed that the electronic configuration is Sr-2(Cr2/33+Cr1/36+)(0.5)Ni0.52+Os5+O6, indicating that the valence state of Os does not change from the host state [Os5+(5d(3))]. Instead, nonmagnetic Cr6+ (3d(0)) is partly generated among coexisting Cr3+ (3d(3)). X-ray magnetic circular dichroism measurements showed that the Os ions are antiferromagnetically coupled to the Cr and ferromagnetically to the Ni. The replacement of antiferromagnetic Cr by ferromagnetic Ni explains the increase of the net magnetism in this ferrimagnetic system. We infer that the strong antiferromagnetic exchange interaction of the 3d(3)-5d(3) configuration associated with the Cr3+-O-Os5+ bond still accounts for the robust high-T-C ferrimagnetism of the Ni-substituted series. We deduce from the experiments that the ferromagnetic exchange interaction of the 3d(8)-5d(3) configuration of the Ni2+-O-Os5+ is stronger than that of the 3d(8)-3d(3) configuration of the Ni2+-O-Cr3+, suggesting that the larger 5d orbital of the Os allows for a stronger virtual hopping from the Ni than the smaller 3d orbital of the Cr. The present results can help to further develop practical materials and to resolve open issues concerning the relative strengths of the various exchange interactions.


Language(s): eng - English
 Dates: 2020-11-162020-11-16
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 102 (18) Sequence Number: 184418 Start / End Page: 1 - 13 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008