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Coherent d-wave superconducting gap in underdoped La2-xSrxCuO4 by angle-resolved photoemission spectroscopy
Swiss Light Source, Paul Scherrer Institute, Villigen.
Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen .
Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, Villigen .
Materials Science Division, Argonne National Laboratory, Argonne.
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2008 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, no 4, 047002- p.Article in journal (Refereed) Published
Abstract [en]

We present angle-resolved photoemission spectroscopy data on moderately underdoped La1.855Sr0.145CuO4 at temperatures below and above the superconducting transition temperature. Unlike previous studies of this material, we observe sharp spectral peaks along the entire underlying Fermi surface in the superconducting state. These peaks trace out an energy gap that follows a simple d-wave form, with a maximum superconducting gap of 14 meV. Our results are consistent with a single gap picture for the cuprates. Furthermore our data on the even more underdoped sample La1.895Sr0.105CuO4 also show sharp spectral peaks, even at the antinode, with a maximum superconducting gap of 26 meV.

Place, publisher, year, edition, pages
2008. Vol. 101, no 4, 047002- p.
Keyword [en]
Copper compounds; Electric conductivity; Emission spectroscopy; Luminescence of organic solids; Photoelectricity; Photoemission; Superconducting transition temperature; Superconductivity;American Physical Society (APS); Angle-resolved photoemission spectroscopy (ARPES); Cuprates; La2 xSrxCuO4 (LSCO); Spectral peaks; Superconducting gaps; Superconducting states; Superconducting transitions; Wave forms; Gallium alloys
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-8057DOI: 10.1103/PhysRevLett.101.047002ISI: 000258427100049Scopus ID: 2-s2.0-48049100977OAI: oai:DiVA.org:kth-8057DiVA: diva2:13278
Note
QC 20100810. Uppdaterad från In press till Published, titel ändrad, tidigare titel: "The coherent d-wave superconducting gap in underdoped La(1.855)Sr(0.145)CuO4) as studied by angle-resolved photoemission" 20100810.Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Adatoms, Quasiparticles & Photons: The Multifaceted World of Photoelectron Spectroscopy
Open this publication in new window or tab >>Adatoms, Quasiparticles & Photons: The Multifaceted World of Photoelectron Spectroscopy
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The experimental work presented in this thesis is based on a wide assortment of very advanced and highly sophisticated photoelectron spectroscopy (PES) techniques. The objective of the present study has been to reveal and understand the electronic structure and electron dynamics in a broad spectrum of materials, ranging from wide band gap oxides, via semiconductors along with metals, and finally high-temperature superconductors.

The first part of the thesis concerns laser-based pump-and-probe PES. This unique experimental technique has permitted a study of the excited electronic structure and the electron dynamics of several semiconductor surfaces. An insight into details of the adatom to restatom charge-transfer of the Ge(111)c(2x8) surface is presented, as well as an estimate for the timescale in which the dynamic adatoms of the Ge(111):Sn(sqrt3xsqrt3)R30deg surface operate. Further results comprise a novel unoccupied surface state at the GaSb(001) surface as well as a time-resolved study of the charge accumulation layer at the InAs(111)A/B surfaces.

In the second part, high-resolution synchrotron based angle-resolved PES (ARPES) data from the cuprate high-temperature superconductor La(2-x)Sr(x)CuO(4) (LSCO) is presented. This extensive study, reveals detailed information about how the Fermi surface and electronic excitations evolve with doping in the superconducting state. The results comprise support for a connection between high- and low-energy electronic responses, the characteristics of the superconducting gap, and indication of a quantum phase transition between two different superconducting phases.

In the third group of experiments we move away from the two-dimensional systems and concentrate on fully three-dimensional compounds. By the use of soft x-ray ARPES it is possible to extract the three-dimensional electronic structure in a straightforward manner with increased k(perpendicular)-resolution. As a result the first high-quality ARPES data from Cu2O is presented, as well as a novel method for extracting the (real space) electron density by ARPES. These experiments clearly display the advantages of using soft x-ray ARPES. If the material and type of experiment is chosen wisely, the benefit of the increased k||-window and the free electron final state, surpass the drawbacks of decreased count-rate and inferior energy resolution. Finally we return to the high-temperature superconductors (NCCO & Nd-LSCO) and make use of the increased bulk-sensitivity. From an evident change in the shape of the Fermi surface when moving from low to high photon energies, the durface to bulk difference in electronic structure is highlighted.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xvi, 54 p.
Series
Trita-ICT/MAP, 2007:12
Keyword
angle-resolved photoelectron spectroscopy, electronic structure, electron dynamics, semiconductor surfaces, oxides, high-temperature superconductors
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-4659 (URN)978-91-7178-822-1 (ISBN)
Public defence
2007-12-13, N1, Isafjordsgatan 28 A/D, Kista, 10:15
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Note
QC 20100810Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2010-08-10Bibliographically approved

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Tjernberg, Oscar

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