Michael Hoppe Libri

The physical properties of transition-metal oxides are influenced by the competition among charge, spin, and orbital degrees of freedom. Advances in deposition techniques enable the growth of thin film heterostructures with atomically sharp interfaces, allowing for the exploration of novel nanoelectronic functionalities and phenomena unique to these interfaces. Oxides that exhibit both magnetic and insulating properties present a promising avenue for enhancing spintronic devices through effective spin-filter effects generated by spin-dependent tunneling. The spinel ferrite NiFe2O4 is particularly promising due to its dual properties at room temperature. This research investigates the interplay between magnetic, electronic, and structural properties in NiFe2O4. Thin films are deposited on Nb-doped SrTiO3 substrates using pulsed laser deposition, with careful evaluation of growth conditions to achieve high-quality, epitaxial films. Emphasis is placed on the effects of reduced dimensionality in ultrathin films (d < 4nm), revealing enhanced saturation magnetization coinciding with reduced lattice constants under compressive strain. Various analyses, including HAXPES, XANES, and XMCD spectroscopy, confirm a consistent cationic coordination across film thickness, ruling out cationic inversion as a cause for enhanced magnetization. Instead, a novel interfacial magnetism is discovered, driven by ferromagnetic ordering of Ti electrons,

The construction of the Main-Danube-Canal in the now dry Ottmaring valley, east of Beilngries, destroyed approximately 21,000 m² of a significant Hallstatt cemetery in southern Germany. This site had previously been partially excavated by Theodor Thenn between 1889 and 1917 and analyzed by W. Torbrügge in the early 1960s. The graves utilized slabs of locally sourced Upper Jurassic limestone. The documented findings classify the burial chambers into three types: Type A (cairn larger than the chamber), Type B (similar within a stone circle), and Type C (cairn not exceeding chamber size and within a stone circle). Additionally, three types of stone circles were identified: Type A (alternating vertical and horizontal stones), Type B (only vertical stones), and Type C (dry-stone wall of horizontal stones). Notably, the numerous small cremation pit burials found between the tumuli appeared in five variants, many topped with a stone grave stele (Type D). The tumuli were organized into at least six groups, constructed in a manner that revealed recognizable horizontal stratigraphy.

Die Arbeit, deren Aktualität angesichts der Flüchtlingskrise in Südeuropa ungebrochen ist, zeigt, wann gegen die Abschiebung eines Asylbewerbers in einen anderen, für das Asylgesuch zuständigen EU-Mitgliedstaat Eilrechtsschutz gewährt werden muss. Die Darstellung erfolgt aus den Perspektiven der EMRK, des EU-Rechts und des Grundgesetzes. Sie legt das dogmatische Fundament offen, auf denen die Urteile des EGMR (M. S. S.) und des EuGH (N. S u. M. E) beruhen und zeigt erstmals umfassend auf, welche Bedeutung Art. 16a GG in diesem Gefüge hat. Sie wertet dazu Rechtsprechung und Äußerungen in der Literatur umfassend aus und ordnet sie in das unions- und verfassungsrechtliche Mehrebenensystem ein. Mit der „Reaktivierung und Neujustierung“ des Konzepts der normativen Vergewisserung zeigt sie einen Weg zu einem unionsrechtskonformen, modernen Verständnis des deutschen Asylgrundrechts. Der Autor kann dabei auf seine Erfahrung als wissenschaftlicher Mitarbeiter beim BVerfG und BVerwG zurückgreifen.

Between 1988 and 1991, a settlement of the Cham Culture was extensively investigated over approximately 3,300 m² in Dietfurt on the Altmühl River. Beneath nearly one meter of flood sediment, the ancient surface and wood remnants were preserved in waterlogged conditions. The site yielded over 150 artefacts made from bone and antler, along with jewellery, making it a unique find for the Cham Culture. Among the artefacts are 33 defined tools (picks, mounts, sleeves, splints, hammers) and 69 incidental tools and waste from antler. The bone tools predominantly consist of points and chisels, accounting for about 70%. Additionally, there are bolt-shaped projectile points and tools crafted from pig canine teeth. The uneven distribution of these tools within the settlement suggests various activity zones. Notably, the jewellery collection, which includes items made from bone, antler, perforated teeth, molluscs, snails, and limestone, is unprecedented for the Cham Culture. Overall, the findings reflect a connection to the Altheim Culture while also showing influences from both nearby and more distant contemporary cultures.