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      Andreev and Single Particle Tunneling Spectroscopies in Underdoped Cuprates

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          Abstract

          We study tunneling spectroscopy between a normal metal and underdoped cuprate superconductor modeled by a phenomenological theory in which the pseudogap is a precursor to the undoped Mott insulator. In the transparent tunneling limit, the spectra show a small energy gap associated with Andreev reflection. In the Giaever limit, the spectra show a large energy gap associated with single particle tunneling. Our theory semi-quantitatively describes the two gap behavior observed in tunneling experiments.

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          Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversion

          G E Blonder, M Tinkham, T. Klapwijk (1982)
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            Angle-resolved photoemission spectroscopy of the cuprate superconductors

            Zhi-Xun Shen, Zahid Hussain, Andrea Damascelli (2002)
            This paper reviews the most recent ARPES results on the cuprate superconductors and their insulating parent and sister compounds, with the purpose of providing an updated summary of the extensive literature in this field. The low energy excitations are discussed with emphasis on some of the most relevant issues, such as the Fermi surface and remnant Fermi surface, the superconducting gap, the pseudogap and d-wave-like dispersion, evidence of electronic inhomogeneity and nano-scale phase separation, the emergence of coherent quasiparticles through the superconducting transition, and many-body effects in the one-particle spectral function due to the interaction of the charge with magnetic and/or lattice degrees of freedom. The first part of the paper introduces photoemission spectroscopy in the context of strongly interacting systems, along with an update on the state-of-the-art instrumentation. The second part provides a brief overview of the scientific issues relevant to the investigation of the low energy electronic structure by ARPES. The rest of the paper is devoted to the review of experimental results from the cuprates and the discussion is organized along conceptual lines: normal-state electronic structure, interlayer interaction, superconducting gap, coherent superconducting peak, pseudogap, electron self energy and collective modes. Within each topic, ARPES data from the various copper oxides are presented.
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              The Nernst effect in high-\(T_c\) superconductors

              Lu Li, Yayu Wang, N. Ong (2005)
              The observation of a large Nernst signal \(e_N\) in an extended region above the critical temperature \(T_c\) in hole-doped cuprates provides evidence that vortex excitations survive above \(T_c\). The results support the scenario that superfluidity vanishes because long-range phase coherence is destroyed by thermally-created vortices (in zero field), and that the pair condensate extends high into the pseudogap state in the underdoped (UD) regime. We present a series of measurements to high fields \(H\) which provide strong evidence for this phase-disordering scenario.
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                Author and article information

                Journal
                Publication date Created: 19 May 2010
                Publication date Updated: 2010-05-29
                Article
                DOI: 10.1103/PhysRevLett.105.167004
                ArXiV ID: 1005.3441
                SO-VID: 97358eeb-38e1-4bf7-b517-640a762c4265
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Journal reference Phys. Rev. Lett. 105, 167004 (2010)
                Comments 5 pages, 4 figures, submitted to Phys. Rev. Lett. minor changes of references
                Categories cond-mat.supr-con

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