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• W2956774407 abstract "Weyl semimetals offer the experimental realisation of an abstract theoretical model, Weyl fermions. What is more, they allow for the study of effects which were so far thought to be accessible only in large scale high energy physics experiments in a simple piece of metal. The bulk of this thesis experimentally investigates the longitudinal magnetoresistance of Weyl semimetals, searching for indications of a chiral anomaly in the longitudinal magnetotransport, i.e. when field and current are aligned. This investigation is done on members of the TaAs family, which consists of TaAs, TaP, NbAs and NbP. Searching for the chiral anomaly in Weyl semimetals, the large transverse magnetoresistance had previously been found to cause strong current inhomogeneities, concealing the intrinsic longitudinal magnetoresistance, ρzz. In this work, these artefacts are avoided by ensuring a homogeneous current injection. The experimental work is accompanied by simulations of the potential distribution in a sample with imperfect current contacts, aiding the interpretation of the experimental results. Also, the known band structure and Fermi energy is used to calculate the orbital longitudinal magnetoresistance to distinguish effects well explained by the 'trivial' band structure from those which are not. The c-axis transport is found to be fully dominated by orbital effects, while the a-axis longitudinal magnetoresistance in both niobium compounds and TaAs is not. Here, the non-monotonous magnetoresistance is attributed to weak localisation effects, which are larger than typically encountered in other materials. In conclusion, no clear indication of a chiral anomaly is found. Two more projects are summarised. First, CoSb3 promised the opportunity for the investigation of a crossover from a trivial semiconductor into a topologically non-trivial material under strain. To find suitable samples, the influence of the growth method on the sample properties is investigated. While no suitable crystals for this experiment could be found, samples grown by a novel inclined rotary Bridgman method allowed for the study of a 3D isotropic electron gas in its quantum limit. The transport properties in fields up to 70 T are found to be consistent with an impurity scattering mediated mechanism, linking the transverse conductivity to the longitudinal one. The second project on UBe13 is a contribution of measurements to solve a long standing question: This heavy-fermion superconductor mostly comes in a 'low'-Tc or a 'high'-Tc type. The two differ in their low-temperature properties, such as the superconducting critical temperature and specific heat. The difference could be traced to the incorporation of aluminium from the flux growth into the lattice, yielding the low-type variety. Annealing leads to aluminium diffusing out of the lattice, which changes the low-temperature properties to those of high-Tc samples." @default.
• W2956774407 created "2019-07-23" @default.
• W2956774407 creator A5064076719 @default.
• W2956774407 date "2019-01-01" @default.
• W2956774407 modified "2023-09-27" @default.
• W2956774407 title "The longitudinal magnetoresistance of Weyl semimetals" @default.
• W2956774407 hasPublicationYear "2019" @default.
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