Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.11: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Quantum Oscillations in the superconducting state of LuNi2B2C — •B. Bergk1, O. Ignatchik1, M. Bartkowiak1, T. Maniv2, V. Zhuravlev2, P.C. Canfield3, and J. Wosnitza1 — 1Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf, Dresden, Germany — 2The Schulich Faculty of Chemistry, Technion Israel Institute of Technology, Haifa, Israel — 3Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa, USA
We have studied the de Haas-van Alphen (dHvA) effect of the borocarbide superconductor LuNi2B2C both in the normal and in the superconducting state by use of the field-modulation method in high magnetic fields up to 15 T and at low temperatures down to 0.5 K. In the superconducting state we observed an additional damping of the dHvA oscillation amplitudes compared to the normal state for different dHvA frequencies. This is due to the opening of the superconducting gap and, therefore, enables us to determine the magnetic-field-dependent gap for different bands from this experiment. The possibility to perform the measurements at various crystal orientations in the magnetic field allows to examine the angular dependence of the superconducting gap parameter.