Electron-phonon superconductivity in APt_3P (A = Sr, Ca, La) compounds: From weak to strong coupling

Alaska Subedi; Luciano Ortenzi; Lilia Boeri

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Electron-phonon superconductivity in APt_3P (A = Sr, Ca, La) compounds: From weak to strong coupling

机译：APt_3P（A = Sr，Ca，La）化合物中的电子声子超导：从弱耦合到强耦合

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We study the newly discovered Pt phosphides APt_3P (A = Sr, Ca, La) [T. Takayama et al., Phys. Rev. Lett. 108, 237001 (2012)] using first-principles calculations and Migdal-Eliashberg theory. Given the remarkable agreement with the experiment, we exclude the charge-density wave scenario proposed by previous first-principles calculations, and give conclusive answers concerning the superconducting state in these materials. The pairing increases from La to Ca and Sr due to changes in the electron-phonon matrix elements and low-frequency phonons. Although we find that all three compounds are well described by conventional s-wave superconductivity and spin-orbit coupling of Pt plays a marginal role, we show that it could be possible to tune the structure from centrosymmetric to noncentrosymmetric opening new perspectives towards the understanding of unconventional superconductivity.

机译：我们研究了新发现的Pt磷化物APt_3P（A = Sr，Ca，La）[T。高山等。牧师108，237001（2012）]使用第一性原理计算和Migdal-Eliashberg理论。考虑到与实验的显着一致性，我们排除了先前的第一性原理计算所提出的电荷密度波情形，并给出了有关这些材料中超导状态的结论性答案。由于电子声子矩阵元素和低频声子的变化，配对从La到Ca和Sr增加。尽管我们发现所有三种化合物都可以通过常规的s波超导性很好地描述，并且Pt的自旋轨道耦合起着边际作用，但我们表明可以将结构从中心对称调整为非中心对称，这为了解Pt开辟了新的视角。非常规超导。

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来源
《Physical review》 |2013年第14期|144504.1-144504.7|共7页
作者
Alaska Subedi; Luciano Ortenzi; Lilia Boeri;
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作者单位

Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;

Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;

Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;

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superconducting materials;

机译：超导材料;

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7. Electron-phonon superconductivity in APt3P (A=Sr, Ca, La) compounds: From weak to strong coupling [O] . Subedi, Alaska, Ortenzi, Luciano, Boeri, Lilia 2013

机译：APt3P（A = Sr，Ca，La）化合物中的电子声子超导：从弱耦合到强耦合

Electron-phonon superconductivity in APt_3P (A = Sr, Ca, La) compounds: From weak to strong coupling

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