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Doped perovskite-based ruthenates: ...

Mamchik, Alexander Ivanovich.

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Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties./
作者:	Mamchik, Alexander Ivanovich.
面頁冊數:	234 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5161.
Contained By:	Dissertation Abstracts International64-10B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3109200

Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties.
Mamchik, Alexander Ivanovich.

Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties. - 234 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5161.

Thesis (Ph.D.)--University of Pennsylvania, 2003.

The electric and magnetic properties of ruthenium-containing ABO 3 oxides with perovskite structure are intimately connected with their structure and composition. Even a slight perturbation caused by doping can significantly modify the electrical conductivity and the magnetic ground state of these compounds. In this thesis the structural, electronic, and magnetic properties of several perovskite ruthenate solid solutions, based on SrRuO 3 and CaRuO3, and containing Fe or Co on the B-sites, are presented. In the Fe-containing compounds, Ru preserves its 4+ valence state, while in the Co-doped compounds there is an order-dependent charge transfer between Ru and Co, leading to some Ru in the 5+ state. Saturation magnetization of solid solutions initially increases with both Fe and Co concentration, indicating the formation of large local magnetic moments around these cations. At higher Fe and Co substitution level, a spin glass state develops and a gradual metal/insulator transition occurs. At the same time, a large negative magnetoresistance emerges. These solid solutions are analogous to Mn-doped diluted magnetic semiconductors that contain giant local moments around Mn impurities, which themselves interact antiferromagnetically. Similar magnetic and magnetoresistive behavior is expected in other conducting ruthenates, and possibly other 4d and 5d conducting oxides that are doped with 3d transition metals.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties.
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100 1 $a Mamchik, Alexander Ivanovich. $3 1952778
245 1 0 $a Doped perovskite-based ruthenates: Structure, electrical, magnetic and magnetoresistive properties.
300 $a 234 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5161.
500 $a Supervisor: I-Wei Chen.
502 $a Thesis (Ph.D.)--University of Pennsylvania, 2003.
520 $a The electric and magnetic properties of ruthenium-containing ABO 3 oxides with perovskite structure are intimately connected with their structure and composition. Even a slight perturbation caused by doping can significantly modify the electrical conductivity and the magnetic ground state of these compounds. In this thesis the structural, electronic, and magnetic properties of several perovskite ruthenate solid solutions, based on SrRuO 3 and CaRuO3, and containing Fe or Co on the B-sites, are presented. In the Fe-containing compounds, Ru preserves its 4+ valence state, while in the Co-doped compounds there is an order-dependent charge transfer between Ru and Co, leading to some Ru in the 5+ state. Saturation magnetization of solid solutions initially increases with both Fe and Co concentration, indicating the formation of large local magnetic moments around these cations. At higher Fe and Co substitution level, a spin glass state develops and a gradual metal/insulator transition occurs. At the same time, a large negative magnetoresistance emerges. These solid solutions are analogous to Mn-doped diluted magnetic semiconductors that contain giant local moments around Mn impurities, which themselves interact antiferromagnetically. Similar magnetic and magnetoresistive behavior is expected in other conducting ruthenates, and possibly other 4d and 5d conducting oxides that are doped with 3d transition metals.
590 $a School code: 0175.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Inorganic. $3 517253
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710 2 0 $a University of Pennsylvania. $3 1017401
773 0 $t Dissertation Abstracts International $g 64-10B.
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791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3109200