Distinct Fermi-Momentum-Dependent Energy Gaps in Deeply Underdoped Bi2212

Tanaka, Kiyohisa; Lee, Wei-Sheng; Lü, Donghui; Fujimori, A.; Fujii, Toshitsugu; Risdiana, Risdiana; Terasaki, Ichiro; Scalapino, D. J.; Devereaux, T. P.; Hussain, Zahid; Shen, Z.‐X.

doi:10.1126/science.1133411

Cited by 382 publications

(467 citation statements)

References 26 publications

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“…It is not yet conclusive whether it is a necessary ingredient (precursor) for high-T c superconductivity [1][2][3][4][5] or if it is a different ordered state. [6][7][8] In the former case, the pseudogap opening temperature T * coincides with the onset temperature of superconductive fluctuation, T sc f , and may merge with T c in the overdoped state. In the latter case, the T * behavior is independent from T sc f , and may cross it on its way to zero temperature at the quantum critical point near the optimal doping of p = 0.19.…”

Section: Introductionmentioning

confidence: 98%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρ ab ) and out-of-plane (ρ c ) resistivity for oxygen-controlled Bi 2 Sr 2 CaCu 2 O 8+δ single crystals subject to magnetic fields (parallel to the c axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, T sc f , is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near T c , whereas the pseudogap opening temperature T * is determined by the semiconductive upturn of the zero-field ρ c . T sc f was found to scale roughly as T c , with a decreasing temperature interval between them upon doping. On the other hand, T * starts out much higher than T sc f but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above T sc f . These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T * exists below T sc f in the heavily overdoped state.

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Section: Introductionmentioning

confidence: 98%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

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“…A wealth of data has appeared in photoemission studies, some of which [1][2][3][4][5][6] has been interpreted using a model of "Fermi arcs" across the Brillouin zone diagonals; other studies [7][8][9] have indicated the presence of pocket Fermi surfaces in the same region of the Brillouin zone. Scanning tunnelling microscopy (STM) studies 10 also indicate a Fermi arc of excitations which appears to end abruptly at the magnetic Brillouin zone boundary associated with two sublattice Néel order.…”

Section: Introductionmentioning

confidence: 99%

Effective theory of Fermi pockets in fluctuating antiferromagnets

Sachdev

2010

Phys. Rev. B

155

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We describe fluctuating two-dimensional metallic antiferromagnets by transforming to a rotating reference frame in which the electron spin polarization is measured by its projections along the local antiferromagnetic order. This leads to a gauge-theoretic description of an 'algebraic charge liquid' involving spinless fermions and a spin S = 1/2 complex scalar. We propose a phenomenological effective lattice Hamiltonian which describes the binding of these particles into gauge-neutral, electron-like excitations, and describe its implications for the electron spectral function across the entire Brillouin zone. We discuss connections of our results to photoemission experiments in the pseudogap regime of the cuprate superconductors.1 arXiv:0912.0943v2 [cond-mat.str-el]

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“…The origin of this gap is one of the central issues in high temperature superconductivity. Recent experimental evidence demonstrates that the pseudogap and the superconducting gap are associated with different energy scales [9,10,11,12,13,14]. It is however not clear whether they coexist independently or compete [9,12,14,15].…”

mentioning

confidence: 99%

Competition between the pseudogap and superconductivity in the high-Tc copper oxides

Kondo

Khasanov

Takeuchi

et al. 2009

Nature

280

351

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A pairing gap and coherence are the two hallmarks of superconductivity. In a classical BCS superconductor they are established simultaneously at T c . In the cuprates, however, an energy gap (pseudogap) extends above T c [1, 2, 3,4,5,6,7,8]. The origin of this gap is one of the central issues in high temperature superconductivity. Recent experimental evidence demonstrates that the pseudogap and the superconducting gap are associated with different energy scales [9,10,11,12,13,14]. It is however not clear whether they coexist independently or compete [9,12,14,15]. In order to understand the physics of cuprates and improve their superconducting properties it is vital to determine whether the pseudogap is friend or foe of high temperature supercondctivity [16]. Here we report evidence from angle resolved photoemission spectroscopy (ARPES) that the pseudogap and high temperature superconductivity represent two competing orders. We find that there is a direct correlation between a loss in the low energy spectral weight due to the pseudogap and a decrease of the coherent fraction of paired electrons. Therefore, the pseudogap competes with the superconductivity by depleting the spectral weight available for pairing in the region of momentum space where the superconducting gap is largest. This leads to a very unusual state in the underdoped cuprates, where only part of the Fermi surface develops coherence.Coherence in the superconducting state of the cuprates manifests itself by the appearance of a narrow peak in the ARPES lineshape [17], while the pseudogap [2, 3,4,12] depletes the low energy spectral weight below the pseudogap energy. The simplicity of the Bi 2 Sr 2 CuO 6+δ (Bi2201) spectra, as measured by ARPES, permits us to perform a straight forward quantitative analysis of the two features because the energy distribution curves (EDCs) in this single layer material lack the large renormalization effects (e.g. peak-hump-dip structure) and bilayer splitting that are present [6,7] in double layered Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212). This feature, however, means the spectral changes associated with the superconducting transition in Bi2201 are much more difficult to observe [18]. By acquiring very high resolution and stable ARPES data with high statistics, we are able to study the temperature and momentum dependence of the spectral weight near the chemical potential, with unprecedented accuracy. Experimental and sample preparation details are provided in the Supplementary Information. In Fig. 1 we examine the temperature dependence of the spectral lineshape in overdoped Bi2201 (T c =29K). Above the pseudogap temperature (T * ) (∼110K for this sample), the symmetrized EDCs [4] (see Supplementary Information) show a peak centered at the chemical potential -consistent with the metallic state of the sample. Upon cooling below T * , the low energy spectral weight decreases (within ∼20 meV), leading to a characteristic dip and very broad spectral peaks that signify the opening of an energy gap, as shown in Fig. 1(d). The loss...

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Distinct Fermi-Momentum-Dependent Energy Gaps in Deeply Underdoped Bi2212

Cited by 382 publications

References 26 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Effective theory of Fermi pockets in fluctuating antiferromagnets

Competition between the pseudogap and superconductivity in the high-Tc copper oxides

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Distinct Fermi-Momentum-Dependent Energy Gaps in Deeply Underdoped Bi2212

Cited by 382 publications

References 26 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Effective theory of Fermi pockets in fluctuating antiferromagnets

Competition between the pseudogap and superconductivity in the high-Tc copper oxides

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Product

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Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements