Unusual ferromagnetism enhancement in ferromagnetically optimal manganite La0.7-yCa0.3+yMn1-yRuyO3 (0≤y<0.3): the role of Mn-Ru t2g super-exchange

被引：27
|
作者：
Liu, M. F. [1 ,2 ]
Du, Z. Z. [1 ,2 ]
Xie, Y. L. [1 ,2 ]
Li, X. [1 ,2 ]
Yan, Z. B. [1 ,2 ]
Liu, J. -M. [1 ,2 ,3 ,4 ]
机构：
[1] Nanjing Univ, Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] S China Normal Univ, Inst Adv Mat, Guangzhou 510006, Guangdong, Peoples R China
[4] S China Normal Univ, Lab Quantum Engn & Mat, Guangzhou 510006, Guangdong, Peoples R China
来源：
SCIENTIFIC REPORTS | 2015年 / 4卷
关键词：
DOPED ND1/2CA1/2MNO3; METAL TRANSITION; PHASE-TRANSITION; MAGNETORESISTANCE; CR; SEPARATION; MAGNETISM; DISORDER;
D O I：
10.1038/srep09922
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The e(g)-orbital double-exchange mechanism as the core of physics of colossal magnetoresistance (CMR) manganites is well known, which usually covers up the role of super-exchange at the t(2g)-orbitals. The role of the double-exchange mechanism is maximized in La0.7Ca0.3MnO3, leading to the concurrent metal-insulator transition and ferromagnetic transition as well as CMR effect. In this work, by a set of synchronous Ru-substitution and Ca-substitution experiments on La0.7-yCa0.3+yMn1-yRuyO3, we demonstrate that the optimal ferromagnetism in La0.7Ca0.3MnO3 can be further enhanced. It is also found that the metal-insulator transition and magnetic transition can be separately modulated. By well-designed experimental schemes with which the Mn3+-Mn4+ double-exchange is damaged as weakly as possible, it is revealed that this ferromagnetism enhancement is attributed to the Mn-Ru t(2g) ferromagnetic super-exchange. The present work allows a platform on which the electro-transport and magnetism of rare-earth manganites can be controlled by means of the t(2g)-orbital physics of strongly correlated transition metal oxides.
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页数：9
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  • [1] Unusual ferromagnetism enhancement in ferromagnetically optimal manganite La0.7−yCa0.3+yMn1−yRuyO3 (0≤y<0.3): the role of Mn-Ru t2g super-exchange
    M. F. Liu
    Z. Z. Du
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    Z. B. Yan
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    Scientific Reports, 5
  • [2] Manipulating the ferromagnetism in narrow-bandwidth Pr1-xCaxMnO3 (0 ≤ x ≤ 0.6) by means of the Mn-Ru t2g ferromagnetic super-exchanges
    Wang, Y. L.
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    Xie, Y. L.
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    Dong, S.
    Liu, J. -M.
    JOURNAL OF APPLIED PHYSICS, 2015, 118 (12)
  • [3] Manipulating the ferromagnetism in narrow-bandwidth Pr1-xCaxMnO3 (0 ≤ x ≤ 0.6) by means of the Mn-Ru t2g ferromagnetic super-exchanges
    1600, American Institute of Physics Inc. (118):
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