复杂氧化物中电子相分离的量子调控

王文彬; 朱银燕; 殷立峰; 沈健

doi:10.7498/aps.67.20182007

摘要

复杂氧化物可以呈现出高温超导、庞磁阻以及多铁效应等诸多新奇的物理现象.这类材料中的电荷/自旋/轨道和晶格自由度之间的强耦合相互作用，可以导致多种相互竞争且能量非常接近的电子态的空间共存，这就是电子相分离现象.如果可以将材料的空间尺寸缩小到电子相分离的特征长度，其物理性质甚至电子关联作用本身都会发生根本的变化，从而有可能实现复杂氧化物中的量子调控.本文综述了我们课题组在过去几年中针对复杂氧化物中电子相分离的量子调控取得的进展，内容包括：发现了锰氧化物边缘电子态，通过氧化物微纳加工技术，实现了量子态空间分布的调控，提高了庞磁阻锰氧化物的临界温度；研究了当材料空间尺度小于其电子相分离特征尺度时电子相分离的表现，确定了在电子相分离消失以后体系的磁结构；通过超晶格生长技术调控了材料中的掺杂有序度，对锰氧化物中大尺度的电子相分离的物理机理从实验上给出了解释.

关键词:

Abstract

Complex oxides system displays exotic properties such as high temperature superconductivity, colossal magnetoresistance and multiferroics. Owing to the strong correlation between lattice, spin, charge and orbital degrees of freedom, competing electronic states in complex oxides system often have close energy scales leading to rich phase diagrams and spatial coexistence of different electronic phases known as electronic phase separation (EPS). When the dimension of complex oxides system is reduced to the length scale of the correlation length of the EPS, one would expect fundamental changes of the correlated behavior. This offers a way to control the physical properties in the EPS system. In this paper, we review our recent works on electronic phase separation in complex oxide systems. We discovered a pronounced ferromagnetic edge state in manganite strips; by using lithographic techniques, we also fabricated antidot arrays in manganite, which show strongly enhanced metal-insulator transition temperature and reduced resistance. Moreover, we discovered a spatial confinement-induced transition from an EPS state featuring coexistence of ferromagnetic metallic and charge order insulating phases to a single ferromagnetic metallic state in manganite. In addition, by using unit cell by unit cell superlattice growth technique, we determined the role of chemical ordering of the dopant in manganite. We show that spatial distribution of the chemical dopants has strong influence on their EPS and physical properties. These works open a new way to manipulate EPS and thus the global physical properties of the complex oxides systems, which is potentially useful for oxides electronic and spintronic device applications.

Keywords:

作者及机构信息

1.
复旦大学微纳电子器件与量子计算机研究院, 上海 200433;

2.
应用表面物理国家重点实验室, 复旦大学物理系, 上海 200433;

3.
人工微结构科学与技术协同创新中心, 南京 210093

通信作者: 沈健, shenj5494@fudan.edu.cn

基金项目: 国家重点研发计划（批准号：2016YFA0300702）、国家重点基础研究发展计划（批准号：2014CB921104）、国家自然科学基金（批准号：11504053）、上海市学术带头人项目（批准号：18XD1400600，17XD1400400）和上海市科委基础研究项目（批准号：18JC1411400，18ZR1403200）资助的课题.

Authors and contacts

1.
Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China;

2.
State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China;

3.
Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

Corresponding author: Shen Jian, shenj5494@fudan.edu.cn

Funds: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300702), the National Basic Research Program of China (Grant No. 2014CB921104), the National Natural Science Foundation of China (Grant No. 11504053), the Program of Shanghai Academic Research Leader, China (Grant Nos. 18XD1400600, 17XD1400400), and Shanghai Municipal Natural Science Foundation, China (Grant Nos. 18JC1411400, 18ZR1403200).

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施引文献

[1]	Lu D H, Yi M, Mo S K, Erickson A S, Analytis J, Chu J H, Singh D J, Hussain Z, Geballe T H, Fisher I R, Shen Z X 2008 Nature 455 81
[2]	Dai P C, Hu J P, Dagotto E 2012 Nat. Phys. 8 709
[3]	Kimura T, Goto T, Shintani H, Ishizaka K, Arima T, Tokura Y 2003 Nature 426 55
[4]	Eerenstein W, Mathur N D, Scott J F 2006 Nature 442 759
[5]	Dagotto E, Hotta T, Moreo A 2001 Physics Reports 344 1
[6]	Tokura Y 2006 Rep. Prog. Phys. 69 797
[7]	Moreo A, Yunoki S, Dagotto E 1999 Science 283 2034
[8]	E D 2003 Springer, Heidelberg pp 313
[9]	Liang L Z, Li L, Wu H, Zhu X H 2014 Nanoscale Research Letters 9 1
[10]	Dulli H, Dowben P A, Liou S H, Plummer E W 2000 Phys. Rev. B 62 14629
[11]	Nascimento V B, Freeland J W, Saniz R, Moore R G, Mazur D, Liu H, Pan M H, RunÅgren J, Gray K E, Rosenberg R A, Zheng H, Mitchell J F, Freeman A J, Veltruska K, Plummer E W 2009 Phys. Rev. Lett. 103 227201
[12]	Freeland J W, Gray K E, Ozyuzer L, Berghuis P, Badica E, Kavich J, Zheng H, Mitchell J F 2005 Nat. Mater. 4 62
[13]	Podzorov V, Kim B G, Kiryukhin V, Gershenson M E, Cheong S W 2001 Phys. Rev. B 64 140406
[14]	Bingham N S, Lampen P, Phan M H, Hoang T D, Chinh H D, Zhang C L, Cheong S W, Srikanth H 2012 Phys. Rev. B 86 064420
[15]	Uehara M, Mori S, Chen C H, Cheong S W 1999 Nature 399 560
[16]	Du K, Zhang K, Dong S, Wei W G, Shao J, Niu J B, Chen J J, Zhu Y Y, Lin H X, Yin X L, Liou S H, Yin L F, Shen J 2015 Nat. Commun. 6 6179
[17]	Zhang L W, Israel C, Biswas A, Greene R L, de Lozanne A 2002 Science 298 805
[18]	Soh Y A, Aeppli G, Mathur N D, Blamire M G 2000 Phys. Rev.B 63 020402
[19]	Soh Y A, Evans P G, Cai Z, Lai B, Kim C Y, Aeppli G, Mathur N D, Blamire M G, Isaacs E D 2002 J. Appl. Phys. 91 7742
[20]	Gillaspie D, Ma J X, Zhai H Y, Ward T Z, Christen H M, Plummer E W, Shen J 2006 J. Appl. Phys. 99 08S901
[21]	Wollan E O, Koehler W C 1955 Phys. Rev. 100 545
[22]	Taran S, Chaudhuri B K, Das A, Nigam A K, Kremer R K, Chatterjee S 2007 Journal of Physics-Condensed Matter 19 216217
[23]	Ma J X, Gillaspie D T, Plummer E W, Shen J 2005 Phys. Rev. Lett. 95 237210
[24]	Martin J I, Nogues J, Liu K, Vicent J L, Schuller I K 2003 Journal of Magnetism and Magnetic Materials 256 449
[25]	Li H, Li L, Liang H X, Cheng L, Zhai X F, Zeng C G 2014 Appl. Phys. Lett. 104 082414
[26]	Kovylina M, Erekhinsky M, Morales R, Villegas J E, Schuller I K, Labarta A, Batlle X 2009 Appl. Phys. Lett. 95 152507
[27]	Frankovsky R, Luetkens H, Tambornino F, Marchuk A, Pascua G, Amato A, Klauss H H, Johrendt D 2013 Phys. Rev. B 87 174515
[28]	Salamon M B, Jaime M 2001 Reviews of Modern Physics 73 583
[29]	Zhang K, Du K, Liu H, Zhang X G, Lan F L, Lin H X, Wei W G, Zhu Y Y, Kou Y F, Shao J, Niu J B, Wang W B, Wu R Q, Yin L F, Plummer E W, Shen J 2015 Proceedings of the National Academy of Sciences of the United States of America 112 9558
[30]	Urushibara A, Moritomo Y, Arima T, Asamitsu A, Kido G, Tokura Y 1995 Phys. Rev. B 51 14103
[31]	Mahendiran R, Maignan A, Hebert S, Martin C, Hervieu M, Raveau B, Mitchell J F, Schiffer P 2002 Phys. Rev. Lett. 89 286602
[32]	Burgy J, Moreo A, Dagotto E 2004 Phys. Rev. Lett. 92 097202
[33]	Ahn K H, Lookman T, Bishop A R 2004 Nature 428 401
[34]	Schmalian J, Wolynes P G 2000 Phys. Rev. Lett. 85 836
[35]	Demko L, Kezsmarki I, Mihaly G, Takeshita N, Tomioka Y, Tokura Y 2008 Phys. Rev. Lett. 101 037206
[36]	Ghivelder L, Parisi F 2005 Phys. Rev. B 71 184425
[37]	Shao J, Liu H, Zhang K, Yu Y, Yu W C, Lin H X, Niu J B, Du K, Kou Y F, Wei W G, Lan F L, Zhu Y Y, Wang W B, Xiao J, Yin L F, Plummer E W, Shen J 2016 Proceedings of the National Academy of Sciences of the United States of America 113 9228
[38]	Ward T Z, Gai Z, Guo H W, Yin L F, Shen J 2011 Phys. Rev. B 83 125125
[39]	Fath M, Freisem S, Menovsky A A, Tomioka Y, Aarts J, Mydosh J A 1999 Science 285 1540
[40]	Moshnyaga V, Sudheendra L, Lebedev O I, Koster S A, Gehrke K, Shapoval O, Belenchuk A, Damaschke B, van Tendeloo G, Samwer K 2006 Phys. Rev. Lett. 97 107205
[41]	RodriguezMartinez L M, Attfield J P 1996 Phys. Rev. B 54 15622
[42]	Moreo A, Mayr M, Feiguin A, Yunoki S, Dagotto E 2000 Phys. Rev. Lett. 84 5568
[43]	Gibert M, Zubko P, Scherwitzl R, Iniguez J, Triscone J M 2012 Nat. Mater. 11 195
[44]	Rogdakis K, Viskadourakis Z, Petrovic A P, Choi E, Lee J, Panagopoulos C 2015 Appl. Phys. Lett. 106 023120
[45]	May S J, Ryan P J, Robertson J L, Kim J W, Santos T S, Karapetrova E, Zarestky J L, Zhai X, te Velthuis S G E, Eckstein J N, Bader S D, Bhattacharya A 2009 Nat. Mater. 8 892
[46]	Zhu Y Y, Du K, Niu J B, Lin L F, Wei W G, Liu H, Lin H X, Zhang K, Yang T Y, Kou Y F, Shao J, Gao X Y, Xu X S, Wu X S, Dong S, Yin L F, Shen J 2016 Nat. Commun. 7 11260
[47]	Zhai H Y, Ma J X, Gillaspie D T, Zhang X G, Ward T Z, Plummer E W, Shen J 2006 Phys. Rev. Lett. 97 167201
[48]	Ward T Z, Liang S, Fuchigami K, Yin L F, Dagotto E, Plummer E W, Shen J 2008 Phys. Rev. Lett. 100 247204
[49]	Bouzerar G, Cepas O 2007 Phys. Rev. B 76 020401
[50]	Dong S, Yu R, Yunoki S, Alvarez G, Liu J M, Dagotto E 2008 Phys. Rev. B 78 201102

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