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1.	Shi, M., et al. (author) Spectroscopic evidence for preformed Cooper pairs in the pseudogap phase of cuprates 2009 In: Europhysics letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 88:2 Journal article (peer-reviewed)abstract Angle-resolved photoemission on underdoped La1.895Sr0.105CuO4 reveals that in the pseudogap phase, the dispersion has two branches located above and below the Fermi level with a minimum at the Fermi momentum. This is characteristic of the Bogoliubov dispersion in the superconducting state. We also observe that the superconducting and pseudogaps have the same d-wave form with the same amplitude. Our observations provide direct evidence for preformed Cooper pairs, implying that the pseudogap phase is a precursor to superconductivity.
2.	Shi, Ming, et al. (author) Coherent d-wave superconducting gap in underdoped La2-xSrxCuO4 by angle-resolved photoemission spectroscopy 2008 In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:4, s. 047002- Journal article (peer-reviewed)abstract 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.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Månsson, Martin (2); Tjernberg, Oscar (2); Mudry, C. (2); Campuzano, J. C. (2); Norman, M. R. (2); Shi, M. (1); show more...; Patthey, L (1); Chang, J (1); Guerrero, S. (1); Rosenkranz, S (1); Claesson, Thomas (1); Mesot, J. (1); Chang, Johan (1); Shi, Ming (1); Pailhés, Stephane (1); Bendounan, Azzedin (1); Patthey, Luc (1); Momono, Naoki (1); Oda, Migaku (1); Ido, Masayuki (1); Mesot, Joël (1); Sassa, Y. (1); Bendounan, A. (1); Ido, M. (1); Oda, M. (1); Momono, N. (1); Razzoli, E. (1); Claesson, Tomas (1); show less...

University: Royal Institute of Technology (2)Undo refine

Language: English (2)

Research subject (UKÄ/SCB): Engineering and Technology (1)

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