Thesis neutron scattering

This thesis describes the experimental investigation of frustrated magnetic systems based on the pyrochlore lattice of corner-sharing tetrahedra. Ho2Ti and Dy2Ti are examples of spin ices, in which the manifold of disordered magnetic groundstates maps onto that of the proton positions in ice. Using single crystal neutron scattering to measure Bragg and diffuse scattering, the effect of applying magnetic fields along different directions in the crystal was investigated. Different schemes of degeneracy removal were observed for different directions.
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Neutron scattering investigations of frustated magnets - NASA/ADS

Timothy Prisk Timothy Prisk investigated the collective excitations and momentum distributions of confined quantum liquids by means of inelastic neutron scattering. Under the guidance of Paul Sokol, he participated in a number of X-ray and neutron scattering experiments at local and national facilities. In addition he studied the magnetic properties of the nanoparticles. Nick defended his thesis in the spring of Yunchang Shin: Development of Ultra-Cold Neutron Moderators Yun studied the low-energy properties of solid methane in order to develop scattering kernels suitable for use at temperatures below 20K the lowest temperature for which kernels presently exist. This work is of relevance to the efforts of LENS to produce very cold neutrons and is also of importance to the development of new ideas for producing Ultra-Cold Neutrons a topic of considerable interest to the Nuclear Physics group at IU.
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Neutron scattering

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Neutron scattering study of the high Tc superconductors. These results indicate the presence of very strong electron spin excitations couplings in electron doped cuprates. Based on the observed dispersion relation, we estimated the effective magnetic exchange coupling using a Heisenberg model.
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