Sr2CoO4-δ薄膜中的自旋玻璃态的磁性质研究

储海峰; 李洁; 李绍; 黎松林; 王佳; 高艳丽; 邓辉; 王宁; 张玉; 吴玉林; 郑东宁

doi:10.7498/aps.59.6585

摘要

用脉冲激光沉积方法(PLD)在铝酸镧衬底上制备了c取向的高氧空位含量的锶钴氧薄膜.X射线衍射分析表明薄膜单一取向且没有明显杂相.原位的高气压反射式高能电子衍射仪(RHEED)监测显示,薄膜为层状生长.通过对薄膜磁化强度随温度、磁场及时间的变化曲线进行测量,发现零场冷曲线上可能存在两个特征温度:Tf和Ta.Tf为对应玻璃态的冻结温度而Ta对应少量的不缺

关键词:

We have fabricated c-axis-oriented Sr2CoO4-δ thin films under relatively low oxygen pressure by the pulsed laser deposition method (PLD) on LaAlO3 substrates. X-ray diffraction and high-pressure reflection high energy electron diffraction (RHEED) demonstrate that the films were well deposited. There exist two different characteristic temperatures, Tf and Ta, in the ZFC curve of temperature dependence of magnetization. Tf may correspond to the freezing temperature while Ta may be related with the anisotropic field of c-axis. Further investigations including magnetic relaxation, memory effect and hysteresis behaviour measurements suggest a main phase of spin glass, which starts the frozen-in process even above the freezing temperature. We ascribe the spin glass behaviour to the competition betwcen double-exchange and super-exchange interactions which could have originated from the coexistence of Co4+ and Co3+ caused by oxygen deficiency in the films.

Keywords:

作者及机构信息

1.
中国科学院物理研究所国家超导重点研究室,北京凝聚态物理国家实验室,北京 100190

基金项目: 国家自然科学基金(批准号:10974243)和国家重点基础研究发展计划(批准号:2006CB921107,2006CB601007,2009CB929102)资助的课题.

Authors and contacts

1.
National Laboratory for Superconductivity, Institute of Physics and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

参考文献

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[11]	Tang Y K, Sun Y, Cheng Z H 2006 Phys. Rev. B 73 012409
[12]	Shimada Y, Miyasaka S, Kumai R, Tokura Y 2006 Phys. Rev. B 73 134424
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[18]	Matsuno J, Okimoto Y, Fang Z, Yu X Z, Matsui Y, Nagaosa N, Kumigashira H, Oshima M, Kawasaki M, Tokura Y 2005 Thin Solid Films 486 113
[19]	Matsuno J, Okimoto Y, Fang Z, Yu X Z, Matsui Y, Nagaosa N, Kawasaki M, Tokura Y 2004 Phys. Rev. Lett. 93 167202
[20]	Ford P J, Mydosh J A 1976 Phys. Rev. B 14 2057
[21]	Wenger L E, Keesom P H 1976 Phys. Rev. B 13 4053
[22]	Meschede D, Steglich F, Felsch W, Maletta H, Zinn W 1980 Phys. Rev. Lett 44 102
[23]	Brodale G E, Fisher R A, Fogle W E, Phillips N E, van Curen J 1983 J. Magn. Magn. Mater. 31-34 1331
[24]	Lundgren L, Svedlindh P, Nordblad P, Beckman O 1983 Phys. Rev. Lett. 51 911
[25]	Granberg P, Sandlund L, Nordblad P, Svedlindh P, Lundgren L 1988 Phys. Rev. B 38 7097
[26]	Fisher D S, Huse D A 1988 Phys. Rev. B 38 373
[27]	Fisher D S, Huse D A 1988 Phys. Rev. B 38 386
[28]	Sasaki M, Jonsson P E, Takayama H, Nordblad P 2004 Phys. Rev. Lett 93 139701
[29]	Nam D N H, Jonason K, Nordblad P, Khiem N V, Phuc N X 1999 Phys. Rev. B 59 4189
[30]	Tang Y K, Sun Y, Cheng Z H 2008 J. Phys.-Condes. Matter 20 095208
[31]	Ulrich M, García-Otero J, Rivas J, Bunde A 2003 Phys. Rev. B 67 024416
[32]	Chen X, Kleemann W, Petracic O, Sichelschmidt O, Cardoso S, Freitas P P 2003 Phys. Rev. B 68 054433
[33]	Mukherjee S, Ranganathan R, Anilkumar P S, Joy P A 1996 Phys. Rev. B 54 9267
[34]	Tang Y K, Sun Y, Cheng Z H 2006 Phys. Rev. B 73 174419

施引文献

[1]	Ruddlesden S N, Popper P 1958 Acta Crystallogr. 11 54
[2]	Freitas R S, Ghivelder L, Damay F, Dias F Cohen L F 2001 Phys. Rev. B 64 144404
[3]	De Teresa J M, Ibarra M R, García J, Blasco J, Ritter C, Algarabel P A, Marquina C del Moral A 1996 Phys. Rev. Lett. 76 3392
[4]	Levy P, Parisi F, Granja L, Indelicato E, Polla G 2002 Phys. Rev. Lett. 89 137001
[5]	Shu M M, Cao S X, Gao T, Yuan S J, Kang B J, Yu L M, Zhang J C 2009 Acta Phys. Sin. 58 3309 (in Chinese)[舒苗苗、曹世勋、高湉、袁淑娟、康保娟、郁黎明、张金仓2009 58 3309]
[6]	Wang Z H, Cai J W, Shen B G, Zhao J G, Zhan W S 1999 Acta Phys. Sin. 48 757 (in Chinese)[王志宏、蔡建旺、沈保根、赵见高、詹文山1999 48 757]
[7]	Rivadulla F, López-Quintela M A, Rivas J 2004 Phys. Rev. Lett. 93 167206
[8]	Mira J, Rivas J, Jonason K, Nordblad P, Breijo M P, Searís Rodríguez M A 1999 J. Magn. Magn. Mater. 196-197 487
[9]	Nam D N H, Mathieu R, Nordblad P, Khiem N V, Phuc N X 2000 Phys. Rev. B 62 8989
[10]	Itoh M, Natori I, Kubota S, Motoya K 1994 J. Phys. Soc. Jpn. 63 1486
[11]	Tang Y K, Sun Y, Cheng Z H 2006 Phys. Rev. B 73 012409
[12]	Shimada Y, Miyasaka S, Kumai R, Tokura Y 2006 Phys. Rev. B 73 134424
[13]	Huang S L, Ruan K Q, Lv Z, Zhuang L H, Wei P, Wu H Y, Li M, Zhang J L, Chai Y S, Yang H S, Cao L Z, Li X G 2006 Phys. Rev. B 73 094431
[14]	Griffiths R B 1969 Phys. Rev. Lett. 23 17
[15]	Bray A J 1987 Phys. Rev. Lett. 59 586
[16]	Wang X L, Takayama-Muromachi E 2005 Phys. Rev. B 72 064401
[17]	Wang X L, Sakurai H, Takayama-Muromachi E 2005 49th Annual Conference on Magnetism and Magnetic Materials Jacksonville, Florida, November, 2004 p10M519
[18]	Matsuno J, Okimoto Y, Fang Z, Yu X Z, Matsui Y, Nagaosa N, Kumigashira H, Oshima M, Kawasaki M, Tokura Y 2005 Thin Solid Films 486 113
[19]	Matsuno J, Okimoto Y, Fang Z, Yu X Z, Matsui Y, Nagaosa N, Kawasaki M, Tokura Y 2004 Phys. Rev. Lett. 93 167202
[20]	Ford P J, Mydosh J A 1976 Phys. Rev. B 14 2057
[21]	Wenger L E, Keesom P H 1976 Phys. Rev. B 13 4053
[22]	Meschede D, Steglich F, Felsch W, Maletta H, Zinn W 1980 Phys. Rev. Lett 44 102
[23]	Brodale G E, Fisher R A, Fogle W E, Phillips N E, van Curen J 1983 J. Magn. Magn. Mater. 31-34 1331
[24]	Lundgren L, Svedlindh P, Nordblad P, Beckman O 1983 Phys. Rev. Lett. 51 911
[25]	Granberg P, Sandlund L, Nordblad P, Svedlindh P, Lundgren L 1988 Phys. Rev. B 38 7097
[26]	Fisher D S, Huse D A 1988 Phys. Rev. B 38 373
[27]	Fisher D S, Huse D A 1988 Phys. Rev. B 38 386
[28]	Sasaki M, Jonsson P E, Takayama H, Nordblad P 2004 Phys. Rev. Lett 93 139701
[29]	Nam D N H, Jonason K, Nordblad P, Khiem N V, Phuc N X 1999 Phys. Rev. B 59 4189
[30]	Tang Y K, Sun Y, Cheng Z H 2008 J. Phys.-Condes. Matter 20 095208
[31]	Ulrich M, García-Otero J, Rivas J, Bunde A 2003 Phys. Rev. B 67 024416
[32]	Chen X, Kleemann W, Petracic O, Sichelschmidt O, Cardoso S, Freitas P P 2003 Phys. Rev. B 68 054433
[33]	Mukherjee S, Ranganathan R, Anilkumar P S, Joy P A 1996 Phys. Rev. B 54 9267
[34]	Tang Y K, Sun Y, Cheng Z H 2006 Phys. Rev. B 73 174419

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