利用传统固相反应法制备了Mn过量的多晶样品La0.5Ca0.5MnO3 (LCMO)、La0.5Ca0.5Mn1.08O3(LCMO08)和La0.5Ca0.5Mn1.22O3(LCMO22),研究了Mn过量对其微观结构及其电输运性质的影响.研究结果表明,随着Mn含量的增加,样品的晶格参数a,b,c以及Mn-O键长都有所增大,而Mn3+-O-Mn4+键角没有明显的变化.输运性质结果表明,金属-绝缘体转变(MIT),庞磁电阻(CMR)效应以及热滞现象都随Mn的过量有着明显的变化,相较于正常化学配比的样品,过量掺杂Mn的样品的绝缘性增强并且热滞现象几乎消失,庞磁电阻在低温也有所增加.电输运性质的剧烈变化归结为过量Mn导致Jahn-Teller畸变增强及双交换作用减弱.实验结果将对理解半掺杂锰氧化物相关体系奇异的物理性质提供参考.
参考文献
| [1] | Dagotto E.;Moreo A.;Hotta T..Colossal magnetoresistant materials: The key role of phase separation [Review][J].Physics Reports: A Review Section of Physics Letters (Section C),20011/3(1/3):1-153. |
| [2] | Goodenough JB.;Zhou JS.;Rivadulla F.;Winkler E..Bond-length fluctuations in transition-metal oxoperovskites[J].International Journal of Quantum Chemistry,20031(1):116-123. |
| [3] | Tokura Y.Critical features of colossal magnetoresistive manganites[J].Reports on Progress in Physics,20063(3):797-851. |
| [4] | Van Tendeloo G;Lebedev OI;Hervieu M;Raveau B.Structure and microstructure of colossal magnetoresistant materials[J].Reports on Progress in Physics,20048(8):1315-1365. |
| [5] | Mori S.;Cheong SW.;Chen CH..Paired and unpaired charge stripes in the ferromagnetic phase of La0.5Ca0.5MnO3[J].Physical review letters,199818(18):3972-3975. |
| [6] | Freitas RS.;Ghivelder L.;Levy P.;Parisi F..Magnetization studies of phase separation in La0.5Ca0.5MnO3 - art. no. 104403[J].Physical Review.B.Condensed Matter,200210(10):4403-0. |
| [7] | Sarkar T;Ghosh B;Raychaudhuri AK;Chatterji T.Crystal structure and physical properties of half-doped manganite nanocrystals of less than 100-nm size[J].Physical review, B. Condensed matter and materials physics,200823(23):235112-1-235112-9-0. |
| [8] | Vasiliu-Doloc L.;Rosenkranz S.;Mesot J.;Mitchell JF.;Sinha SK.;Seeck OH.;Lynn JW.;Islam Z.;Osborn R..Polaron ordering in ferromagnetic colossal magnetoresistive oxides[J].International Journal of Modern Physics, B. Condensed Matter Physics, Statistical Physics, Applied Physics,200029/31(29/31):3711-3718. |
| [9] | Salamon MB.;Jaime M..The physics of manganites: Structure and transport [Review][J].Reviews of Modern Physics,20013(3):583-628. |
| [10] | Dagotto, E.Complexity in strongly correlated electronic systems[J].Science,20055732(5732):257-262. |
| [11] | Renwen Li;Zhe Qu;Jun Fang;Xiaoman Yu;Lei Zhang;Yuheng Zhang.Magnetic properties of Bi-doped La0:5Ca0:5MnO3[J].Solid State Communications,20109/10(9/10):389-392. |
| [12] | Antonakos A;Liarokapis E;Aydogdu GH;Habermeier HU.Strain effects on La0.5Ca0.5MnO3 thin films[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,20071/3(1/3):83-88. |
| [13] | MollahI;Dhiman;A. Das.Structural and magnetic properties of La_(0.85)Ca_(0.15)Mn_(1-x)Cr_xO_3[J].Materials Letters,20115(5):922-925. |
| [14] | Chen X;Dong SA;Wang KF;Liu JM;Dagotto E.Nonmagnetic B-site impurity-induced ferromagnetic tendency in CE-type manganites[J].Physical review, B. Condensed matter and materials physics,20092(2):024410-1-024410-7-0. |
| [15] | Pradhan, K;Mukherjee, A;Majumdar, P.Exploiting B-site disorder for phase control in the manganites[J].EPL,20083(3):37007:1-37007:5. |
| [16] | Pradhan K;Mukherjee A;Majumdar P.Distinct effects of homogeneous weak disorder and dilute strong scatterers on phase competition in manganites[J].Physical review letters,200714(14):147206-1-147206-4-0. |
| [17] | Raveau B.;Martin C.;Hervieu M.;Maignan A.;Zhao YM..Mn-site doped CaMnO3: Creation of the CMR effect[J].International Journal of Quantum Chemistry,20001(1):203-207. |
| [18] | Lu WJ;Sun YP;Zhao BC;Zhu XB;Song WH.Inhomogeneous strain and phase coexistence in Bi0.4Ca0.6MnO3[J].Physical review, B. Condensed matter and materials physics,200621(21):4409-1-4409-6-0. |
| [19] | 刘丽军 .钙钛矿氧化物的B位掺杂效应[D].扬州大学,2012. |
| [20] | Agarwal, Vasudha;Sharma, Geetanjali;Siwach, P. K.;Maurya, K. K.;Awana, V. P. S.;Singh, H. K..Crossover from charge order to strain glass in phase separated manganite thin films: Impact of thermal cycling and substrate induced strain[J].Solid State Communications,2015:43-47. |
| [21] | Origin of the Magnetoelectric Coupling Effect in Pb(Zr_(0.2)Ti_(0.8))O_3/La_(0.8)Sr_(0.2)MnO_3 Multiferroic Heterostructures[J].Physical review letters,201012(12):p.127202.1. |
| [22] | 刘宝琴;刘振华;任世超;刘丽君;张春伟;何军辉.LaB0.5Mn0.5O3（B=Co,Fe）的磁性及电输运特性的研究[J].低温物理学报,2011(2):146-150. |
| [23] | Jung WH.;Iguchi E..Electrical conduction behaviour in K2NiF4-type Ca2MnO3.98 below room temperature[J].Journal of Physics, D. Applied Physics: A Europhysics Journal,19987(7):794-799. |
| [24] | Krichene, A.;Solanki, P. S.;Venkateshwarlu, D.;Rayaprol, S.;Ganesan, V.;Boujelben, W.;Kuberkar, D. G..Magnetic and electrical studies on La0.4Sm0.1Ca0.5MnO3 charge ordered manganite[J].Journal of Magnetism and Magnetic Materials,2015:470-477. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%