...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review >Pressure-induced phase transition and superconductivity in YBa_2Cu_4O_8
【24h】

Pressure-induced phase transition and superconductivity in YBa_2Cu_4O_8

机译：YBa_2Cu_4O_8的压力诱导相变和超导

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

We investigate the pressure and temperature dependence of the lattice dynamics of the underdoped, stoichiometric, high-temperature superconductor YBa_2Cu_4O_8 by means of Raman spectroscopy and ab initio calculations. This system undergoes a reversible pressure-induced structural phase transition around 10 GPa to a collapsed orthorhombic structure that is well reproduced by the calculation. The coupling of the B_(1g)-like buckling phonon mode to the electronic continuum is used to probe superconductivity. In the low pressure phase, self-energy effects through the superconducting transition renormalize this phonon, and the amplitude of this renormalization strongly increases with pressure. Whereas our calculation indicates that this mode's coupling to the electronic system is only marginally affected by the structural phase transition, the aforementioned renormalization is completely suppressed in the high pressure phase, demonstrating that under hydrostatic pressures higher than 10 GPa, superconductivity in YBa_2Cu_4O_8 is greatly weakened or obliterated.
机译：我们通过拉曼光谱和从头算计算研究了掺杂不足的，化学计量的高温超导体YBa_2Cu_4O_8的晶格动力学对压力和温度的依赖性。该系统经历了大约10 GPa的可逆压力诱导的结构相变，变为坍塌的正交结构，通过计算可以很好地再现该结构。类似于B_（1g）的屈曲声子模式与电子连续体的耦合用于探测超导性。在低压阶段，通过超导跃迁的自能效应使该声子重新归一化，并且该重新归一化的幅度随压力而大大增加。尽管我们的计算表明该模式与电子系统的耦合仅受结构相变的影响很小，但上述重归一化在高压相中被完全抑制，这表明在静水压高于10 GPa的情况下，YBa_2Cu_4O_8中的超导性大大减弱了或消失了。

著录项

  • 来源
    《Physical review》 |2014年第14期|140501.1-140501.5|共5页
  • 作者

    S. M. Souliou; A. Subedi; Y. T. Song; C. T. Lin; K. Syassen; B. Keimer; M. Le Tacon;

  • 作者单位

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Centre de Physique Theorique, Ecole Polytechnique, CNRS, F-91128 Palaiseau Cedex, France;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany,Research & Development Center for Functional Crystals, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190, China;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

    Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse I, D-70569 Stuttgart, Germany;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    pressure effects; density functional theory, local density approximation, gradient and other corrections;

    机译：压力影响;密度泛函理论;局部密度近似;梯度和其他校正;

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