...
  • 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 >Small-q electron-phonon scattering in all crystalline 'unconventional' superconductors
【24h】

Small-q electron-phonon scattering in all crystalline 'unconventional' superconductors

机译：所有晶体“非常规”超导体中的小q电子声子散射

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

All unconventional superconductors belong to families of materials of which the majority are insulators. We argue that they 'survive' in the metallic regime because they are close to instabilities at small-q (phase separation) contrary to the insulators which are 'victims' of instabilities at large-q. The proximity to a small-q instability is shown to be a plausible generic feature of Fermi-liquid systems with short-ranged coulomb correlations (Hubbard-like), coupled adiabatically to phonons. The presence of antiferromagnetic phases in the insulator regions of the phase diagrams illustrates the short-range character of the Coulomb repulsion, a necessary ingredient for our picture. We show that the resulting small-q electron-phonon scattering may naturally lead to unconventional superconductivity of d-wave or other gap symmetry. The superconducting gap symmetry is controlled by the Coulomb pseudopotential. This provides a generic mechanism for phonon mediated unconventional superconductivity that could be relevant for all crystalline unconventional superconductors. What could differentiate cuprates and lead to high-T_c is possibly the addition of the Anderson interlayer tunneling processes which correspond effectively to q = 0 pairing.
机译：所有非常规超导体都属于材料族，其中大多数是绝缘体。我们认为，它们在金属状态下“生存”是因为它们在小q（相分离）处接近不稳定性，而绝缘子则是在大q处成为不稳定性的“受害者”。表现出与小q不稳定性的接近是费米-液体系的短距离库仑相关（类似哈伯德）的绝热系，它绝热地与声子耦合。相图的绝缘子区域中反铁磁相的存在说明了库仑排斥的短程特性，这是我们图片的必要成分。我们表明，由此产生的小q电子声子散射可能自然导致d波或其他间隙对称的非常规超导。超导间隙对称性由库仑伪势控制。这为声子介导的非常规超导性提供了一种通用机制，该机制可能与所有晶体非常规超导体有关。可以区分铜价并导致高T_c的原因可能是增加了Anderson层间隧穿过程，该过程有效地对应于q = 0配对。

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