PrBa_2Cu_3O_(6.3)和YBa_2Cu_3O_(6.3)材料的红外声子谱的比较  

A COMPARISON OF INFRARED PHONON SPECTRA BETWEEN YBa 2Cu 3O 6.3 and PrBa 2Cu 3O 6.3

作　　者：叶红娟[1,2,3,4] 李标[1,2,3,4] 熊光成 王瑞兰[1,2,3,4] 刘鹏 

机构地区：[1]中国科学院上海技术物理研究所红外物理国家重点实验室 [2]北京大学物理系介观物理国家实验室 [3]中国科学院物理研究所超导国家实验室 [4]西安交通大学电子材料研究所

出　　处：《红外与毫米波学报》1998年第1期37-41,共5页Journal of Infrared and Millimeter Waves

基　　金：上海自然科学基金

摘　　要：报道了ＹＢａ２Ｃｕ３Ｏ６．３和ＰｒＢａ２Ｃｕ３Ｏ６．３多晶陶瓷ｃ轴取向薄膜样品的红外光谱，在Ｐｒ－Ｂａ２Ｃｕ３Ｏ６．３中观察到９个声子模，对应于５Ｅｕ＋４Ａ２ｕ振动。在ＹＢａ２Ｃｕ３Ｏ６．３材料中观察到１０个声子模，对应于６Ｅｕ＋４Ａ２ｕ振动，其中Ｐｒ的Ｅｕ和Ａ２ｕ模分别为位于１７０ｃｍ－１和１９８ｃｍ－１，Ｙ和Ｅｕ和Ａ２ｕ模分别位于１９１ｃｍ－１和２１７ｃｍ－１．ＰｒＢａ２Ｃｕ３Ｏ６．３和ＹＢａ２Ｃｕ３Ｏ６．３有类似的晶体结构，比较和分析它们的Ｅｕ和Ａ２ｕ模，并根据振动模的频率与质量平方根成反比的规律，认为Ｐｒ在缺氧的四方相ＰｒＢａ２Ｃｕ３Ｏ６．The infrared spectra of YBa 2Cu 3O 6.3 and PrBa 2Cu 3O 6.3 ceramics and films with c axis orientation were reported. In PrBa 2Cu 3O 6.3 , 9 phonon modes corresponding to 5E u+4A 2u vibration were observed, where the E u and A 2u modes of Pr element were found at 170 and 198cm -1 , respectively.In YBa 2Cu 3O 6.3 ,10 modes corresponding to 6E u+4A 2u vibration were observed, where the E u and A 2u modes of Y element were located at 191 and 217cm -1 , respectively. Since YBa 2Cu 3O 6.3 and PrBa 2Cu 3O 6.3 possess similar crystal structures, by comparing and analyzing their E u and A 2u modes based on the regulation that the vibration frequency is inversely proportional to the square root of the mass, it can be inferred that the valence of Pr in oxygen deficient tetragonal PrBa 2Cu 3O 6.3 is 3 +.

关 键 词：YBCO PBCO 声子模 超导材料 红外声子谱 

分 类 号：TM263.014[一般工业技术—材料科学与工程]