Two Energy Gaps and Fermi-Surface “Arcs” inNbSe2

2009/04/20 by С. В. Борисенко, S. V. Borisenko, A. A. Kordyuk +12 · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.102.166402

published as Phys. Rev. Lett. 102 166402 (2009) · Related work http://www.ifw-dresden.de/institutes/iff/research/SC/arpes

openalex publication_date 2009/04/20 · arxiv created 2009/04/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/03

Abstract

Using angle-resolved photoemission spectroscopy, we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens in the regions of the momentum space connected by the CDW vectors, which implies a nesting mechanism of CDW formation. In remarkable analogy with the pseudogap in cuprates, the detected energy gap also exists in the normal state (T>T0) where it breaks the Fermi surface into "arcs," it is nonmonotonic as a function of temperature with a local minimum at the CDW transition temperature (T0), and it forestalls the superconducting gap by excluding the nested portions of the Fermi surface from participating in superconductivity.

Citations

• A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2
• Quasiparticle Spectra, Charge-Density Waves, Superconductivity, and Electron-Phonon Coupling in2H−NbSe2
• Penetration Depth Study of Superconducting Gap Structure of2H−NbSe2
• An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates

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