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首页> 外文期刊>Physical review >Temperature-dependent electron-phonon coupling in La_(2-x)Sr_xCuO_4 probed by femtosecond x-ray diffraction
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Temperature-dependent electron-phonon coupling in La_(2-x)Sr_xCuO_4 probed by femtosecond x-ray diffraction

机译：飞秒X射线衍射探测La_（2-x）Sr_xCuO_4中温度依赖的电子-声子耦合

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摘要

The strength of the electron-phonon coupling parameter and its evolution throughout a solid's phase diagram often determines phenomena such as superconductivity, charge- and spin-density waves. Its experimental determination relies on the ability to distinguish thermally activated phonons from those emitted by conduction band electrons, which can be achieved in an elegant way by ultrafast techniques. Separating the electronic from the out-of-equilibrium lattice subsystems, we probed their reequilibration by monitoring the transient lattice temperature through femtosecond x-ray diffraction in La_(2-x)Sr_xCuO_4 single crystals with x = 0.1 and 0.21. The temperature dependence of the electron-phonon coupling is obtained experimentally and shows similar trends to what is expected from the ab initio calculated shape of the electronic density of states near the Fermi energy. This study evidences the important role of band effects in the electron-lattice interaction in solids, in particular, in superconductors.
机译：电子-声子耦合参数的强度及其在整个固体相图中的演变通常决定着诸如超导，电荷和自旋密度波之类的现象。它的实验确定取决于将热活化声子与导带电子发射的声子区分开的能力，这可以通过超快技术以优雅的方式实现。将电子与非平衡晶格子系统分开，我们通过飞秒X射线衍射在x = 0.1和0.21的La_（2-x）Sr_xCuO_4单晶中监测瞬态晶格温度，从而探究了它们的再平衡。电子-声子耦合的温度依赖性是通过实验获得的，并且显示出与从费米能量附近的态的电子密度的从头算起的形状所期望的趋势相似的趋势。这项研究证明了能带效应在固体，特别是超导体中的电子-晶格相互作用中的重要作用。

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  • 来源
    《Physical review》 |2013年第5期|054507.1-054507.9|共9页
  • 作者

    B. Mansart; M. J. G. Cottet; G. F. Mancini; T. Jarlborg; S. B. Dugdale; S. L. Johnson; S. O. Mariager; C. J. Milne; P. Beaud; S. Gruebel; J. A. Johnson; T. Kubacka; G. Ingold; K. Prsa; H. M. Ronnow; K. Conder; E. Pomjakushina; M. Chergui; F. Carbone;

  • 作者单位

    Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    DPMC, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland,ETH-Zuerich, CH-8093 Zuerich, Switzerland;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    Laboratory of Ultrafast Spectroscopy, ISIC, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    ETH-Zuerich, CH-8093 Zuerich, Switzerland;

    Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland;

    Laboratory for Quantum Magnetism, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Laboratory for Quantum Magnetism, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland;

    Laboratory for Developments and Methods, PSI, CH-5232 Villigen PSI, Switzerland;

    Laboratory of Ultrafast Spectroscopy, ISIC, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

    Laboratory for Ultrafast Microscopy and Electron Scattering, ICMP, Ecole Polytechnique Federate de Lausanne, CH-1015 Lausanne, Switzerland;

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