• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physica, C. Superconductivity and its applications >Phase separation in Ca substituted YBCO
【24h】

Phase separation in Ca substituted YBCO

机译：Ca取代的YBCO中的相分离

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A room temperature micro-Raman spectroscopic study at hydrostatic pressures up to 4GPa has been carried out on Y1-xCaxBa2Cu3O7-delta polycrystalline superconducting compounds with x = 0.00-0.20 and delta = 0.045-0.005. Apart from the five strong Raman active phonons (4A(g) + 1B(1g)-like), additional structures have been observed in the y(cc)(y) over bar (402 cm(-1)) and the y(xx)(y) over bar (300 and 322 cm(-1)) scattering configurations with increasing intensities with the Ca content. The modes that appear in the out-of-phase B-1g phonon of O-pl are related to the disorder introduced by the Ca substitution for Y and to a local mode induced by the Ca atoms. The variation, with x, of the relative intensities of the constituent peaks of the O-pl in-phase phonon indicates that this phonon behavior depends on the amount of oxygen and not the concentration of the Ca substitution introduced carriers. There seem to exist two oxygen content differentiated phases which are present also in the pure oxygen overdoped YBCO. The insensitivity of the O-pl in-phase mode frequency combined with the behavior of the O-apex phonon, can be attributed to the excess charge distribution away from the CuO2 planes. A phase separation seems to be induced for hydrostatic pressures above 3GPa possibly related to the Ca atom cluster formation. [References: 4]
机译：在x = 0.00-0.20和delta = 0.045-0.005的Y1-xCaxBa2Cu3O7-δ多晶超导化合物上进行了在高达4GPa的静水压力下的室温微拉曼光谱研究。除了五个强拉曼有源声子（4A（g）+ 1B（1g）状）外，还观察到在bar（402 cm（-1））上方的y（cc）（y）和y（ xx）（y）在棒（300和322 cm（-1））上的散射配置，其强度随Ca含量的增加而增加。 O-p1的异相B-1g声子中出现的模式与Ca取代Y引起的无序和Ca原子诱导的局部模式有关。 O-p1同相声子的组成峰的相对强度随x的变化表明该声子行为取决于氧的量而不取决于Ca取代引入的载流子的浓度。似乎存在两个氧含量微分相，它们也存在于纯氧过量掺杂的YBCO中。 O-pl同相模式频率的不敏感性与O-顶点声子的行为相结合，可以归因于远离CuO2平面的多余电荷分布。对于高于3GPa的静水压力，似乎引起了相分离，这可能与Ca原子簇的形成有关。 [参考：4]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号