衬底温度和生长氧压对La_(0.67)Sr_(0.33)MnO_3: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_(0.67)Sr_(0.33)MnO_3:Ag_(0.08) Thin Films

作　　者：晏益志[1] 殷学鹏[1] 刘翔[1] 陈清明[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《无机材料学报》2014年第7期753-757,共5页Journal of Inorganic Materials

基　　金：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)~~

摘　　要：通过化学共沉淀法制备了La0.67Sr0.33MnO3:Ag0.08(LSMO:Ag0.08)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:Ag0.08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(Up)、优值(Fm)和各向异性Seebeck系数(△S);在优化的衬底温度和生长氧压条件下,长程Jahn-Teller协变引起△S数值提高,这是LIV信号增强的主要原因。Lao.67Sr0.33MnO3：Ag0.08 （LSMO：Ag0.08） polycrystalline ceramics were prepared by chemical co-precipitation method, and then La0.67Sr0,33MnO3：Ago.08 thin films were prepared on vicinal cut LaA103 （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 （Up）, the figure of merit （Fro） and anisotropy Seebeck coefficient （AS） are obtained for LSMO：Ag0.08 thin films when growth temperature and oxygen pressure are 790 ℃ and 45 Pa, respectively. The LIV enhancement of LSMO：Ago.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.

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 

分 类 号：TB321[一般工业技术—材料科学与工程]