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Kugler, Martin; Fischer, Ø.; Renner, Christoph; Ono, Shimpei; Ando, Yoichi

doi:10.1103/physrevlett.86.4911

Cited by 181 publications

(170 citation statements)

References 25 publications

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“…There are two different proposals to explain the PG; one is associated with the formation of local incoherent pairs above T c (precursor pairing) [1] and the other is not directly related to the superconductivity and rather competes with superconductivity [2,3,4]. The former is based on the experimental results from angleresolved photoemission spectroscopy (ARPES) [5,6,7] and tunneling spectroscopy [8,9], which demonstrate a smooth evolution of the superconducting (SC) gap into the PG across T c , and the overall d-wave symmetry of PG [10,11]. The latter scenario is based on ARPES [12,13,14,15], tunneling spectroscopy [16], and Raman scattering [17] studies, which reported two different types of energy gaps; a SC gap which opens below T c in the nodal region and an antinodal PG whose magnitude shows a T -independence across T c .…”

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confidence: 99%

Evolution of a Pairing-Induced Pseudogap from the Superconducting Gap of(Bi,Pb)2Sr2CuO6

et al. 2009

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We have performed an ultrahigh-resolution angle-resolved photoemission spectroscopy study of slightly-overdoped (Bi,Pb)2Sr2CuO6 to elucidate the origin of pseudogap. By using a newly developed xenon-plasma light source, we determined the comprehensive momentum and temperature dependences of the superconducting gap and the pseudogap. We found that the antinodal pseudogap persists far above the superconducting transition temperature and is smoothly connected to the nodal gap. The characteristic temperature of the pseudogap scales well with the superconductinggap size irrespective of the momentum location. The present experimental results point to the pairing origin of the pseudogap.PACS numbers: 74.72. Hs, 74.25.Jb, The anomalies of various physical properties in underdoped high-T c (transition temperature) cuprate superconductors above T c are related to the opening of an energy gap at the Fermi level (E F ) known as a pseudogap (PG). The PG has been observed in both spin and charge excitations, and regarded as a key ingredient to understand the mechanism of high-T c superconductivity. There are two different proposals to explain the PG; one is associated with the formation of local incoherent pairs above T c (precursor pairing) [1] and the other is not directly related to the superconductivity and rather competes with superconductivity [2,3,4]. The former is based on the experimental results from angleresolved photoemission spectroscopy (ARPES) [5,6,7] and tunneling spectroscopy [8,9], which demonstrate a smooth evolution of the superconducting (SC) gap into the PG across T c , and the overall d-wave symmetry of PG [10,11]. The latter scenario is based on ARPES [12,13,14,15], tunneling spectroscopy [16], and Raman scattering [17] studies, which reported two different types of energy gaps; a SC gap which opens below T c in the nodal region and an antinodal PG whose magnitude shows a T -independence across T c . These apparently different proposals cause a critical disagreement on the nature of PG. One of the main reasons to cause such a controversy is the lack of experimental data on the systematic T -and k-dependences of the PG and the SC gap in a wider parameter range. Since it has been reported that the two-gap-like behavior is significantly enhanced in single-layered low-T c cuprates [13,14,15,18], Bi 2 Sr 2 CuO 6 (Bi2201) provides a good opportunity to investigate these issues.In this Letter, we report an ARPES study of the PG and the SC gap in slightly-overdoped Bi2201. By using a newly developed xenon (Xe)-plasma light source [19] which enables ultrahigh energy-and momentum-resolved measurements, we have revealed a smooth connection between the SC gap and the PG in the k space as well as across T c , in contrast to the observation of two-energy scales in underdoped Bi2201 [13,14,15]. We also found that the PG has a d-wave ground state. These experimental results strongly suggest that the observed PG is caused by the precursor pairing. We also provide a possible clue to settle the controversy on the origin ...

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confidence: 99%

Evolution of a Pairing-Induced Pseudogap from the Superconducting Gap of(Bi,Pb)2Sr2CuO6

et al. 2009

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“…The σ(V ) curves have an inverted parabolic shape, which might indicate the presence of van-Hove singularity close to the Fermi level in slightly OD samples. The behaviour of the SG in UD samples at T → T c is one of the most important and yet controversial issues [12,17]. For UD samples the peak is much weaker than for OD samples even at low T , cf.…”

Section: Temperature and Doping Dependenciesmentioning

confidence: 99%

Intrinsic tunneling spectroscopy: a look from the inside at HTSC

Krasnov

2004

Physica C: Superconductivity

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Layered structure of Bi-2212 high Tc superconductor (HTSC), provides a unique opportunity to probe quasiparticle density of states inside a bulk single crystal by means of intrinsic (interlayer) tunneling spectroscopy. Here I present a systematic study of intrinsic tunneling characteristics of Bi-2212 as a function of doping, temperature, magnetic field and intercalation. An improved resolution made it possible to simultaneously trace the superconducting gap (SG) and the normal state pseudo-gap (PG) in a close vicinity of Tc and to analyze closing of the PG at T * . The obtained doping phase diagram exhibits a critical doping point for appearance of the PG and a characteristic crossing of the SG and the PG close to the optimal doping. All this points towards coexistence of two different and competing order parameters in Bi-2212.

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“…The term pseudogap has been coined to describe this kind of physics. The presence of pseudogap has been established through the measurements of the nuclear magnetic resonance (NMR) [5], the scanning tunneling spectroscopy [6][7][8][9], the analysis of the electronic Raman scattering [10][11][12], through time-resolved optical spectroscopy [13][14][15][16][17][18], and through the ARPES [19][20][21][22][23][24][25]. The observed strong Nernst effect in cuprates has been also attributed to it [26][27][28].…”

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confidence: 99%

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

et al. 2010

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We argue that three gaps observed in underdoped cuprates can be attributed to the formation of antiferromagnetic spin polarons and bipolarons. Within the spin polaron scenario the antinodal pseudogap at he high energy scale originates from the change of the Fermi surface topology, induced by antiferromagnetic correlations. That change gives rise to the diminishing of the spectral weight at the antinodal region near the Brillouin zone boundary. We demonstrate that effect by analyzing effective models of doped antiferromagnets. The second type of pseudogap appearing at the intermediate energy scale originates from the phenomena which are precursory to superconductivity and predominantly concern the portion of the Fermi surface near the nodal region. In order to analyze the latter phenomenon we use the negative U Hubbard model, in which many details typical to spin polaron physics are neglected, but which contains the essential ingredient of it, that is the strong short range attraction. The lowest energy scale is related to the true superconducting gap which develops with doping, although both types of pseudogap diminish with doping. This behavior can be explained by the fact that the spin polaron band is empty in the undoped system and therefore the formation of the superconducting state in the system is forbidden. Due to a pedagogical character of this report, we present in the introduction a short overview of mostly recent experimental results which are related to the gap-pseudogap physics.

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Scanning Tunneling Spectroscopy ofBi2Sr2CuO6+δ

Cited by 181 publications

References 25 publications

Evolution of a Pairing-Induced Pseudogap from the Superconducting Gap of(Bi,Pb)2Sr2CuO6

Evolution of a Pairing-Induced Pseudogap from the Superconducting Gap of(Bi,Pb)2Sr2CuO6

Intrinsic tunneling spectroscopy: a look from the inside at HTSC

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

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