[en] The Bavarian Higher Administrative Court declared the development plan for the Westlicher Taxoeldener Forst (Wackersdorf) to be invalid because of offence against the order to weigh the substantial interests of all parties concerned prior to the development planning decisions. It seems likely that an appellate proceedings based on section 47, sub-sec. (7), 1. sentence VwGO n.F. will be successful. The article in hand discusses the parallelism of the problem pairs area development planning/licensing in accordance with air pollution abatement laws, and area development planning/industrial installations licensing. The compromise developed by the Bavarian Higher Administrative Court in its decision of April 2, 1987, namely to exclude the licensing requirements of section 7 Atomic Energy Law and the radiological aspects, is not feasible, and would call for an all-encompassing conflict solution. The effects of the judicial review on the construction permits issued for the Wackersdorf reprocessing plant, the aspects of substantive law and the letter of the law, as well as possibility to cure by subsequent presentation of reasons, or by re-interpretation, are discussed by the author. De jure, the author says, a cessation of construction work would be the only proper solution, and would demonstrate political culture. (HP)

[en] The exact crystallographic and electronic structure plays an important role for the occurrence of quantum criticality, magnetic order, and superconductivity in the family of transition-metal pnictides AT_2Pn_2. The pnictide-distance z is a crucial parameter for the electronic structure because the distance between the T_2Pn_2 layers determines whether the tetragonal crystal structure is collapsed or uncollapsed and, thereby, whether pnictide bonds are formed or not. We have investigated the influence of the P z position on the band structure of the strongly enhanced Pauli paramagnet SrCo_2P_2, a close relative to the superconducting iron arsenides, that is on the verge of magnetic order. The pronounced temperature dependence of the P z position influences the density of states (DOS) at the Fermi energy strongly. Therefore, we have investigated the Fermi surface of SrCo_2P_2 in the paramagnetic ground state with the de Haas-van Alphen effect. We compare our experimental results to band-structure calculations in order to determine the exact contribution of individual orbits to the DOS. We will also address the renormalization of the effective masses and the dimensionality of the Fermi surface.

[en] Angular-dependent de Haas-van Alphen measurements allow the mapping of Fermi surfaces in great detail with high accuracy. Density functional electronic-structure calculations can be carried out with high precision, but depend crucially on the used structural information and the applied calculational approximations. We report in a detailed study the sensitivity of the calculated electronic band structure of the 122 compound LaFe₂P₂ on (i) the exact P position in the unit cell, parametrized by a so-called z parameter, and on (ii) the treatment of the La 4f  states. Depending on the chosen exchange and correlation-potential approximation, the calculated z parameter varies slightly and corresponding small but distinctive differences in the calculated band structure and Fermi-surface topology appear. Similarly, topology changes appear when the energy of the mostly unoccupied La 4f  states is corrected regarding their experimentally observed position. The calculated results are compared to experimental de Haas-van Alphen data. Our findings show a high sensitivity of the calculated band structure on the pnictide z position and the need for an accurate experimental determination of this parameter at low temperatures, and a particular need for a sophisticated treatment of the La 4f  states. Thus, this is not only crucial for the special case of LaFe₂P₂ studied here, but of importance for the precise determination of the band structure of related 122 materials and La containing compounds in general. (paper)