Two Types of Charge Ordering in the Half-Doped Manganites of Bi0.5(Ca,Sr)0.5MnO3
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概要
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From our study of the evolution of charge ordering in Bi0.5Ca0.5-xSrxMnO3 ($x = 0--0.5$) with chemical pressure, we found the detailed nature of two distinct charge ordering schemes, associated with the structural change from $Pnma$- to $Imma$-type symmetry at $x = 0.2--0.25$. Charge ordering for $x = 0--0.2$ ($Pnma$) is consistent with the checkerboard-type pattern, commonly observed in half-doped manganites. On the other hand, a large tolerance factor for $x = 0.25--0.5$ ($Imma$) stabilizes a double-stripe charge ordering scheme. These findings indicate the bicritical nature of two competing charge ordered states and provide further insight towards understanding the dominant charge ordering mechanism in half-doped manganites.
- 2009-04-15
著者
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Oh Se-jung
School Of Physics And Center For Strongly Correlated Materials Research Seoul National University
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Cheong Sang-wook
Rutgers Center For Emergent Materials And Department Of Physics And Astronomy Rutgers University
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Ahn Jai-seok
Rutgers Center For Emergent Materials And Department Of Physics And Astronomy Rutgers University
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Sharma Peter
Rutgers Center For Emergent Materials And Department Of Physics And Astronomy Rutgers University
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Horibe Yoichi
Rutgers Center For Emergent Materials And Department Of Physics And Astronomy Rutgers University
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Chen Cheng-hsuan
Center For Condensed Matter Sciences National Taiwan University
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Mori Shigeo
Department Of Equilibrium Adaptation Research Division Of Higher Nervous Control Research Institute
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Oh Se-Jung
School of Physics and Center for Strongly Correlated Materials Research, Seoul National University, Seoul 151-742, Republic of Korea
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Chen Cheng-Hsuan
Center for Condensed Matter Sciences, National Taiwan University, Taipei 101, Taiwan
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Mori Shigeo
Department of Materials Science, Osaka Prefecture University, Osaka 599-8531
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Sharma Peter
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.
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Ahn Jai-Seok
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.
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Horibe Yoichi
Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, U.S.A.
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