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Direct observation of a Fermi surface and superconducting gap in LuNi2B2C by Starowicz, P.; Liu, C.; Khasanov, R.; Kondo, T.; Samolyuk, G.; Gardenghi, D.; Ohta, Y. Lee T.; Harmon, B.; Canfield, P.; Budko, S.; Rotenberg, E.; Kaminski, A. is a scholarly article available to read on EtoBox.

What is Direct observation of a Fermi surface and superconducting gap in LuNi2B2C about?

We measured the Fermi surface (FS), band dispersion and superconducting gap in LuNi2B2C using Angle Resolved Photoemission Spectroscopy. Experimental data were compared with the tight-binding version of the Linear Muffin-Tin Orbital (LMTO) method and Linearized Augmented Plane-Wave (LAPW) calculations. We found reasonable agreement between the two calculations and experimental data. The measured FS exhibits large parallel regions with a nesting vector that agrees with a previous positron annihilation study and calculations of the generalized susceptibility. The measured dispersion curves also agree reasonably well with the TB-LMTO calculations, albeit with some differences in the strength of the hybridization. In addition, the spectrum in the superconducting state revealed a 2meV superconducting gap. The data also clearly shows the presence of a coherent peak above the chemical potential, that originates from thermally excited electrons above the energy of 2 delta. This feature was not previously observed in the Lu-based material.

Author

Starowicz, P.; Liu, C.; Khasanov, R.; Kondo, T.; Samolyuk, G.; Gardenghi, D.; Ohta, Y. Lee T.; Harmon, B.; Canfield, P.; Budko, S.; Rotenberg, E.; Kaminski, A.

Published

2008

Language

EN