Coherent d-wave superconducting gap in underdoped La2-xSrxCuO4 by angle-resolved photoemission spectroscopy

• 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Annan teknik -- Övrig annan teknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Other Engineering and Technologies -- Other Engineering and Technologies not elsewhere specified (hsv//eng)

Nyckelord

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

Material physics with surface physics

Materialfysik med ytfysik

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