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钙钛矿锰氧化物(以下简称锰氧化物, 如La1-xSrxMnO3等, x为掺杂浓度)因其优异的电、磁性质受到人们广泛的关注, 但是对于其材料内部载流子性质的认识至今仍没有统一定论. 本文基于锰氧化物内Mn-O链的特点, 建立一维紧束缚模型, 对锰氧化物载流子的性质展开研究. 发现在掺杂浓度x=0.5时, 系统处于铁磁态, 自旋能级完全劈裂, 价带和导带之间存在带隙, 所有电子态呈现扩展行为. 进一步掺杂, 将出现局域电子态, 同时伴随着晶格的局域畸变, 形成所谓的极化子. 伴随着极化子的出现, 带隙中出现极化子深能级. 极化子携带的电荷量越多, 形成的晶格缺陷越深, 局域能级也越深. 当极化子的电荷量继续增加时, 极化子解离, 载流子倾向于形成能量更低的正反"孤子"对.
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[1] Jonker G H, van Santen J H 1950 Physica 16 337
[2] Wollan E O, Koehler W C 1955 Phys. Rev. 100 545
[3] Chahara K, Ohno T, Kasai M, Kozono Y 1993 Appl. Phys. Lett. 63 1990
[4] von Helmolt R, Wecker J, Holzapfel B, Schultz L, Samwer K 1993 Phys. Rev. Lett. 71 2331
[5] Park J H, Vescovo E, Kim H J, Kwon C, Ramesh R, Venkatesan T 1998 Nature 392 794
[6] Ravindran P, Kjekshus A, Fjellvåg H, Delin A, Eriksson O 2002 Phys. Rev. B 65 064445
[7] Hartinger Ch, Mayr F, Loidl A, Kopp T 2006 Phys. Rev. B 73 024408
[8] Millis A J 1998 Nature 392 147
[9] Chen Y, Ueland B G, Lynn J W, Bychkov G L, Barilo S N, Mukovskii Y M 2008 Phys. Rev. B 78 212301
[10] Yoon S, Liu H L, Schollerer G, Cooper S L, Han P D, Payne D A, Cheong S W, Fisk Z 1998 Phys. Rev. B 58 2795
[11] Lanzara A, Saini N L, Brunelli M, Natali F, Bianconi A, Radaelli P G, Cheong S W 1998 Phys. Rev. Lett. 81 878
[12] Xie S J, Ahn K H, Smith D L, Bishop A R, Saxena A 2003 Phys. Rev. B 67 125202
[13] Rościszewski K, Oleś A M 2007 J. Phys.: Condens. Matter 19 186223
[14] Weber F, Aliouane N, Zheng H, Mitchell J F, Argyriou D N, Reznik D 2009 Nat. Mater. 8 798
[15] Kida N, Tonouchi M 2002 Phys. Rev. B 66 024401
[16] Barone P, Picozzi S, van den Brink J 2011 Phys. Rev. B 83 233103
[17] van den Brink J, Khaliullin G, Khomskii D 1999 Phys. Rev. Lett. 83 5118
[18] Sboychakov A O, Kugel K I, Rakhmanov A L, Khomskii D I 2011 Phys. Rev. B 83 205123
[19] Ahn K H, Millis A J 2000 Phys. Rev. B 61 13545
[20] Hotta T, Takada Y, Koizumi H, Dagotto E 2000 Phys. Rev. Lett. 84 2477
[21] Salamon M B, Jaime M 2001 Rev. Mod. Phys. 73 583
[22] Kraus R, Schrade M, Schuster R, Knupfer M, Revcolevschi A, Büchner B, Geck J 2011 Phys. Rev. B 83 165130
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