Charakterisierung elektronischer und magnetischer Eigenschaften in Seltenen Erd-Borkarbiden

TL;DRAbstract

This thesis deals with the experimental characterisation of electronic and magnetic properties in single crystalline RE-borocarbides. Measurements of dHvA-oscillations in the nonmagnetic and below Tc = 16.3 K superconducting compound LuNi2B2C result in new insights of the underlying fermi surfaces. Especially one of the measured cross sections shows gapless behavior in the superconducting state. Comparative studies with bandstructure calculations and the related compound YNi2B2C reveal the similarities and differences in the geometry of the fermi surfaces, with tendencies to larger effective masses in LuNi2B2C compared to YNi2B2C. The measured angular dependence Bc2(T, alpha) at low temperatures contradicts the forecasts of an unconventional d-wave-model, which was under consideration to be the responsible mechanism for superconductivity in the borocarbides. The measured Bc2(T)-dependence and the quantitative results of the dHvA-experiments allow a theoretical description of the unusua

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