衬底温度和生长氧压对La0.67Sr0.33MnO3:Ag0.08薄膜激光感生电压效应的影响

doi:10.3724/SP.J.1077.2014.13562

无机材料学报 ›› 2014, Vol. 29 ›› Issue (7): 753-757.DOI: 10.3724/SP.J.1077.2014.13562 CSTR: 32189.14.SP.J.1077.2014.13562

衬底温度和生长氧压对La_0.67Sr_0.33MnO₃:Ag_0.08薄膜激光感生电压效应的影响

晏益志, 殷学鹏, 刘翔, 陈清明

(昆明理工大学材料科学与工程学院, 昆明 650093)

收稿日期:2013-10-29 修回日期:2014-01-10 出版日期:2014-07-20 网络出版日期:2014-06-20
作者简介:晏益志(1986–), 男, 硕士研究生. E-mail: yanyizhi2005@163.com
基金资助:
国家自然科学基金(50974066);云南省自然科学基金(2009ZC013M);昆明理工大学人才培养基金(KKZ3201351012)

Influence of Growth Temperature and Oxygen Pressure on Laser-induced Voltage Effect of La_0.67Sr_0.33MnO₃:Ag_0.08Thin Films

YAN Yi-Zhi, YIN Xue-Peng, LIU Xiang, CHEN Qing-Ming

(Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China)

Received:2013-10-29 Revised:2014-01-10 Published:2014-07-20 Online:2014-06-20
About author:YAN Yi-Zhi. E-mail: yanyizhi2005@163.com
Supported by:
National Natural Science Foundation of China (50974066);Natural Science Foundation of Yunnan Province (2009ZC013M);Talent Cultivation Foundation of Kunming University of Science and Technology (KKZ3201351012)

摘要/Abstract

摘要：

通过化学共沉淀法制备了La_0.67Sr_0.33MnO₃:Ag_0.08 (LSMO:Ag_0.08)多晶材料, 然后采用脉冲激光沉积(PLD)技术在LaAlO₃ (LAO)倾斜衬底上制备了LSMO:Ag_0.08薄膜。研究了衬底温度和生长氧压对薄膜结构、电输运特性及激光感生电压(LIV)效应的影响。结果表明: 当衬底温度为790℃、生长氧压为45 Pa时, 薄膜具有最大峰值电压(U_p)、优值(F_m)和各向异性Seebeck系数(ΔS); 在优化的衬底温度和生长氧压条件下, 长程Jahn-Teller协变引起ΔS数值提高, 这是LIV信号增强的主要原因。

关键词: 衬底温度, 生长氧压, 脉冲激光沉积, 激光感生电压, Seebeck系数

Abstract:

La_0.67Sr_0.33MnO₃:Ag_0.08(LSMO:Ag_0.08) polycrystalline ceramics were prepared by chemical co-precipitation method, and then La_0.67Sr_0.33MnO₃:Ag_0.08 thin films were prepared on vicinal cut LaAlO₃ (LAO) substrates by pulsed laser deposition (PLD) technique. Effects of growth temperature and oxygen pressure on structure, electrical transport properties and laser-induced voltage (LIV) effect were investigated. The results show that the maximum LIV peak (U_p), the figure of merit (F_m) and anisotropy Seebeck coefficient (ΔS) are obtained for LSMO:Ag_0.08 thin films when growth temperature and oxygen pressure are 790 ℃ and 45 Pa, respectively. The LIV enhancement of LSMO:Ag_0.08 thin films is due to the anisotropy of the Seebeck coefficient, which is produced by long range cooperative Jahn-Teller distortions under optimal growth temperature and oxygen pressure conditions.

Key words: growth temperature, oxygen pressure, pulsed laser deposition, laser-induced voltage, anisotropic Seebeck coefficient

中图分类号:

TB321

晏益志, 殷学鹏, 刘翔, 陈清明. 衬底温度和生长氧压对La_0.67Sr_0.33MnO₃:Ag_0.08薄膜激光感生电压效应的影响[J]. 无机材料学报, 2014, 29(7): 753-757.

YAN Yi-Zhi, YIN Xue-Peng, LIU Xiang, CHEN Qing-Ming. Influence of Growth Temperature and Oxygen Pressure on Laser-induced Voltage Effect of La_0.67Sr_0.33MnO₃:Ag_0.08Thin Films[J]. Journal of Inorganic Materials, 2014, 29(7): 753-757.

图/表 4

图1 不同衬底温度制备LSMO:Ag0.08薄膜的XRD图谱(a)和ρ-T曲线(b)

Fig.1 XRD patterns (a) and ρ-T curves (b) of LSMO:Ag0.08 thin films with different growth temperature. Inset graph shows the TCR curves

图2 不同生长氧压制备LSMO:Ag0.08薄膜的XRD图谱(a)和ρ-T曲线(b)

Fig. 2 XRD patterns (a) and ρ-T curves (b) of LSMO:Ag0.08 thin films with different oxygen pressure. Inset graph shows the TCR curves

图3 不同衬底温度(a)和不同生长氧压(b)的LSMO:Ag0.08薄膜的LIV信号

Fig. 3 The LIV signals of LSMO:Ag0.08 thin films with different grown temperature (a) and different oxygen pressure (b)

表1 LSMO:Ag0.08薄膜样品的计算参数

Table 1 The measured parameters of the LSMO:Ag0.08 thin films

Growth condition	c/nm	T_p/K	TCR/%	U_P/mV	τ /ns	F_m/(mV•ns^-1)	?_ZT/(K•cm^-1)	ΔS/(μV•K^-1)
Different grown temperature	45 Pa	760℃	0.387	315	1.2	672	36.73	18.30	1.23×10⁸	0.2185
		790℃	0.394	338	2.3	1100	42.85	25.67	1.05×10⁸	0.4190
		820℃	0.391	341	1.8	284	35.21	8.07	1.28×10⁸	0.0680
Different oxygen pressure	790 ℃	15 Pa	0.388	349	1.2	374	26.97	13.87	1.67×10⁸	0.0896
		45 Pa	0.394	338	2.3	1100	42.85	25.67	1.05×10⁸	0.4190
		75 Pa	0.392	358	2.4	416	29.70	14.01	1.52×10⁸	0.1095

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衬底温度和生长氧压对La_0.67Sr_0.33MnO₃:Ag_0.08薄膜激光感生电压效应的影响

Influence of Growth Temperature and Oxygen Pressure on Laser-induced Voltage Effect of La_0.67Sr_0.33MnO₃:Ag_0.08Thin Films

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