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Kunisada S, Adachi S, Sakai S, Sasaki N, Nakayama M, Akebi S, Kuroda K, Sasagawa T, Watanabe T, Shin S, Kondo T. Observation of Bogoliubov Band Hybridization in the Optimally Doped Trilayer Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{10+δ}. PHYSICAL REVIEW LETTERS 2017; 119:217001. [PMID: 29219391 DOI: 10.1103/physrevlett.119.217001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Indexed: 06/07/2023]
Abstract
Using a laser-excited angle-resolved photoemission spectroscopy capable of bulk sensitive and high-energy resolution measurements, we reveal a new phenomenon of superconductors in the optimally doped trilayer Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{10+δ}. We observe a hybridization of the Bogoliubov bands derived from the inner and outer CuO_{2} planes with different magnitudes of energy gaps. Our data clearly exhibit the splitting of coherent peaks and the consequent enhancement of spectral gaps. These features are reproduced by model calculations, which indicate that the gap enhancement extends over a wide range of Fermi surface up to the antinode. The significant modulation of electron pairing uncovered here might be a crucial factor to achieve the highest critical temperature in the trilayer cuprates.
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Affiliation(s)
- So Kunisada
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Shintaro Adachi
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
- MANA, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
| | - Shiro Sakai
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Nae Sasaki
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | | | - Shuntaro Akebi
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Kenta Kuroda
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Takao Sasagawa
- Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan
| | - Takao Watanabe
- Graduate School of Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561, Japan
| | - Shik Shin
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Takeshi Kondo
- ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Sekine R, Ogata K, Tsukada A, Miyakawa N. Two Sizes of Superconducting Gaps on an Under-doped Bi2.1Sr1.9Ca2Cu3O10+δ with TC ∼ 101K by Tunneling Spectroscopy. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.phpro.2014.09.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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3
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Electronic and spin structures of solids investigated by means of synchrotron radiation photoemission. Radiat Phys Chem Oxf Engl 1993 2013. [DOI: 10.1016/j.radphyschem.2013.01.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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First direct observation of the Van Hove singularity in the tunnelling spectra of cuprates. Nat Commun 2011; 2:221. [PMID: 21364560 PMCID: PMC3072078 DOI: 10.1038/ncomms1229] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Accepted: 02/03/2011] [Indexed: 11/08/2022] Open
Abstract
In two-dimensional (2D) lattices, the electronic levels are unevenly spaced, and the density of states (DOS) displays a logarithmic divergence known as the Van Hove singularity (VHS). This is the case in particular for the layered cuprate superconductors. The scanning tunnelling microscope (STM) probes the DOS, and is therefore the ideal tool to observe the VHS. No STM study of cuprate superconductors has reported such an observation so far giving rise to a debate about the possibility of observing directly the normal state DOS in the tunnelling spectra. In this study, we show for the first time that the VHS is unambiguously observed in STM measurements performed on the cuprate Bi₂Sr₂CuO(₆+δ) (Bi-2201). Beside closing the debate, our analysis proves the presence of the pseudogap in the overdoped side of the phase diagram of Bi-2201 and discredits the scenario of the pseudogap phase crossing the superconducting dome.
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Müller B, Dudy L, Janowitz C, Manzke R. Comment on "Superconducting coherence peak in the electronic excitations of a single-layer Bi(2)Sr(1.6)La(0.4)CuO(6 + delta) cuprate superconductor". PHYSICAL REVIEW LETTERS 2009; 103:109701-109702. [PMID: 19792350 DOI: 10.1103/physrevlett.103.109701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Indexed: 05/28/2023]
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6
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Lee WS, Tanaka K, Vishik IM, Lu DH, Moore RG, Eisaki H, Iyo A, Devereaux TP, Shen ZX. Dependence of band-renormalization effects on the number of copper oxide layers in Tl-based copper oxide superconductors revealed by angle-resolved photoemission spectroscopy. PHYSICAL REVIEW LETTERS 2009; 103:067003. [PMID: 19792598 DOI: 10.1103/physrevlett.103.067003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Indexed: 05/28/2023]
Abstract
Here we report the first angle-resolved photoemission measurement on nearly optimally doped multilayer Tl-based superconducting cuprates (Tl-2212 and Tl-1223) and a comparison study to single-layer (Tl-2201) compound. A "kink" in the band dispersion is found in all three compounds but exhibits different momentum dependence for the single-layer and multilayer compounds, reminiscent to that of Bi-based cuprates. This layer number dependent renormalization effect strongly implies that the spin-resonance mode is unlikely to be responsible for the dramatic renormalization effect near the antinodal region.
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Affiliation(s)
- W S Lee
- SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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Niestemski LR, Wang Z. Valence bond glass theory of electronic disorder and the pseudogap state of high-temperature cuprate superconductors. PHYSICAL REVIEW LETTERS 2009; 102:107001. [PMID: 19392145 DOI: 10.1103/physrevlett.102.107001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Indexed: 05/27/2023]
Abstract
We show that the low-energy fluctuations of the valence bond due to the superexchange are pinned by the electronic disorder from off-stoichiometric dopants, leading to a valence bond glass (VBG) pseudogap phase in underdoped high-T_{c} cuprates. The antinodal Fermi surface sections are gapped out, giving rise to a normal state Fermi arc whose length shrinks with underdoping. Below T_{c}, the superexchange interaction induces a d-wave superconducting gap that coexists with the VBG pseudogap. The evolution of the local and momentum-space spectroscopy with doping and temperature captures the salient properties of the pseudogap phenomena and the electronic disorder.
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Kondo T, Khasanov R, Takeuchi T, Schmalian J, Kaminski A. Competition between the pseudogap and superconductivity in the high-T(c) copper oxides. Nature 2009; 457:296-300. [PMID: 19148096 DOI: 10.1038/nature07644] [Citation(s) in RCA: 222] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Accepted: 11/10/2008] [Indexed: 11/09/2022]
Abstract
In a classical Bardeen-Cooper-Schrieffer superconductor, pairing and coherence of electrons are established simultaneously below the critical transition temperature (T(c)), giving rise to a gap in the electronic energy spectrum. In the high-T(c) copper oxide superconductors, however, a pseudogap extends above T(c). The relationship between the pseudogap and superconductivity is one of the central issues in this field. Spectral gaps arising from pairing precursors are qualitatively similar to those caused by competing electronic states, rendering a standard approach to their analysis inconclusive. The issue can be settled, however, by studying the correlation between the weights associated with the pseudogap and superconductivity spectral features. Here we report a study of two spectral weights using angle-resolved photoemission spectroscopy. The weight of the superconducting coherent peak increases away from the node following the trend of the superconducting gap, but starts to decrease in the antinodal region. This striking non-monotonicity reveals the presence of a competing state. We demonstrate a direct correlation, for different values of momenta and doping, between the loss in the low-energy spectral weight arising from the opening of the pseudogap and a decrease in the spectral weight associated with superconductivity. We therefore conclude that the pseudogap competes with the superconductivity by depleting the spectral weight available for pairing.
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Affiliation(s)
- Takeshi Kondo
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
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Ma JH, Pan ZH, Niestemski FC, Neupane M, Xu YM, Richard P, Nakayama K, Sato T, Takahashi T, Luo HQ, Fang L, Wen HH, Wang Z, Ding H, Madhavan V. Coexistence of competing orders with two energy gaps in real and momentum space in the high temperature superconductor Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}. PHYSICAL REVIEW LETTERS 2008; 101:207002. [PMID: 19113369 DOI: 10.1103/physrevlett.101.207002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2008] [Indexed: 05/27/2023]
Abstract
Through a combined scanning tunneling microscopy and angle-resolved photoemission spectroscopy study, we report the observation of two distinct gaps (a small and a large gap) that coexist both in real space and in the antinodal region of momentum space, below the superconducting transition temperature (T_{c}) of Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}. We show that the small gap is associated with superconductivity. The large-gap persists above T_{c}, and seems linked to observed charge ordering. We find a strong correlation between the large and small gaps suggesting that they are affected by similar physical processes.
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Affiliation(s)
- J-H Ma
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
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