Ph.D. (Physics) / Compounds of rare-earth (RE) elements (Ce, Yb, Eu) as well as actinide element U with partially filled 4f or 5f shells have been receiving considerable attention in the field of low temperature studies. This stems from the diversity of magnetic ground state exhibited by the compounds. These range from non-magnetic, metallic, ferromagnetic or antiferromagnetic ordered state. The nature of the ground state depends on the balance between the on-site Kondo interaction, which mostly favours a local non-magnetic singlet and also the indirect Rudderman-Kittel-Kasuya- Yosida (RKKY) exchange interactions. The interactions of the localized f moments with their environment result in the crystal electric field (CEF) effects at the rare-earth (RE) ion site which splits the free-ion ground-state multiplet. The competing energy scales of CEF splitting, Kondo and RKKY interaction cause the large variety of exceptional phenomena observed in rare earth systems, such as heavy-fermion (HF) behaviour, intermediate valence, unconventional superconductivity, and quantum criticality. Generally, the low-temperature properties of RE systems depend sensitively on the position of the undisturbed 4f state with respect to the Fermi level. Thus, the hybridization between the 4f and conduction-electron states may give rise to either an enhanced density of states (DOS) near the Fermi level in HF metals or to the formation of a gap at Fermi level in Kondo insulators. Recent considerable research interest in strongly correlated electron systems (SCES) studies has been the study of intermetallic compounds close to magnetic instability and the introduction of non-Fermi-liquid (NFL) state. NFL behaviour in f-electron systems is characterized by special power laws and logarithmic divergences in temperature of the physical properties of materials at low temperatures...

Surgically implanted thermoregulating ferromagnetic seeds as a mean of inducing hyperthermia in malignant tumors has been successfully introduced in a clinical environment at the University of Arizona. This work covers topics in quality assurance for the method on two levels. The first level deals with the magnetic induction system where magnetic and electric fields are measured. A discussion on safety levels for patients and treatment personnel is given, and an optically coupled probe for magnetic field measurements is described. The second level treats the electrical characteristics of the ferromagnetic seeds. Systems to measure the permeability and conductivity of the seeds are presented with some typical results. Finally, hysteresis power loss in a seed is measured and compared to losses due to eddy currents.

Includes bibliographical references (p. 54-56).

Thesis (Ph. D.)--Rutgers University, 2009. / "Graduate Program in Physics and Astronomy." Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 2002. / Vita. Includes bibliographical references (leaves 130-134).

Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.

Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003. / Includes bibliographical references (leaves 61-62). Also available in electronic version. Access restricted to campus users.

Thesis (M.S.)--West Virginia University, 2003. / Title from document title page. On t.p. "x̲" is subscript. Document formatted into pages; contains viii, 34 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 30-31).

Thesis (Ph. D.)--University of Missouri-Columbia, 2003. / Typescript. Vita. Includes bibliographical references. Also available on the Internet.

The present work is mostly focused on theoretical study of multiferroics and magnetic semiconductors within the framework of density functional theory (DFT). We studied Bi₂NiMnO₆ which was recently synthesized as a heavily distorted double perovskite with four formula units in a monoclinic unit cell. The calculated GGA and GGA+U magnetizations per formula unit were 4.92 and 4.99 [mu]B and the calculated ferroelectric polarizations were 16.83 and 16.63 [mu]C cm⁻². We also present the results of completely relaxed electronic structure calculations for multiferroic LaMnO₃/BaTiO₃ structure which was built by joining a slab of magnetic LaMnO₃ with a slab of ferroelectric BaTiO₃. The study of Mn doped GeTe, which is a diluted magnetic semiconductor (DMS), shows the net magnetization as a function of doping and holes concentration. In addition, we present a study of ferroelectric GeTe as a function of applied pressure and the interesting properties exhibited by Si(001)/Si(110) junction which was experimentally built using hybrid orientation technology (HOT).