When low- and high-energy electronic responses meet in cuprate superconductors

Chang  J; Pailhes  S; Shi  MMansson  MClaesson  TTjernberg  OVoigt  JPerez  VPatthey  LMomono  N

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When low- and high-energy electronic responses meet in cuprate superconductors

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The existence of coherent quasiparticles near the Fermi energy in the low-temperature state of high-temperature superconductors has been well established by angle-resolved photoemission spectroscopy (ARPES). We present a study of La1.83Sr0.17CuO4 in the superconducting state and report an abrupt change in the quasiparticle spectral function, as we follow the dispersion of the ARPES signal from the Fermi energy to 0.6 eV. The interruption in the quasiparticle dispersion separates coherent quasiparticle peaks at low energies from broad incoherent excitations at high energies. We find that the boundary between these low-energy and high-energy features exhibits a cosine-shaped momentum dependence, reminiscent of the superconducting d-wave gap. Further intriguing similarities between characteristics of the incoherent excitations and quasiparticle properties suggest a close relation between the electronic response at high and low energies in cuprate superconductors.

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《Physical review, B. Condensed matter and materials physics》 |2007年第22期|4508-1-4508-6-0|共6页
作者
Chang J; Pailhes S; Shi MMansson MClaesson TTjernberg OVoigt JPerez VPatthey LMomono N;
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作者单位

ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland;

Paul Scherrer Inst, CH-5232 Villigen, Switzerland;

Royal Inst Technol, KTH, S-16440 Kista, SwedenKFA Julich GmbH, Forschungszentrum, Inst Solid State Phys, D-52425 Julich, GermanyHokkaido Univ, Dept Phys, Sapporo, Hokkaido 0600810, JapanCondensed Matter Theory Grp, CH-5232 Villigen, Switzerland;

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正文语种英语
中图分类固体物理学;
关键词
HIGH-TEMPERATURE SUPERCONDUCTORS; T-C SUPERCONDUCTORS; EXCITATIONS; OXIDES; MODE;

When low- and high-energy electronic responses meet in cuprate superconductors

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