Master of Science in Physics
Physics and Astronomy
Andrew Cornelius, Committee Chair
First Committee Member
Second Committee Member
Graduate Faculty Representative
Number of Pages
Materials with a geometrically frustrated magnetic pyrochlore lattice have been of interest due to their unusual ground states. Tb 2 Ti 2 O 7 is known for having a spin liquid ground state which does not transition to a long-range ordered state down to at least 50 mK. Ho 2 Ti 2 O 7 has a macroscopically degenerate spin ice ground state which resembles that of the proton ordering in water ice. Heat Capacity measurements of Tb 2 Ti 2- x Sn x O 7 were done down to 0.36 K and AC magnetic susceptibility measurements of Ho 2- x Y x Ti 2 O 7 and Ho 2- x La x Ti 2 O 7 were done for frequencies from 10 Hz to 10 kHz down to 1.8 K, both in magnetic fields up to 9 T. These experiments were performed in an effort to further understanding of the factors that lead to their unusual behavior and to study the effects of introducing disorder through doping with nonmagnetic elements. Determination of the effect of an external field on the hyperfine crystal field at the Tb sites was done. In addition, unusual behavior in the ac susceptibility of the Ho samples at lower temperatures was observed.
Atomic spins; Geometrical frustrations; Heat capacities; Holmiun titanates; Long range magnetic orders; Magnetic pyrochlore lattices; Pyrochlores; Terbium titanates
Condensed Matter Physics
Antonio, Daniel, "AC susceptibility and heat capacity studies of the geometrically frustrated pyrochlores terbium titanium tin oxides and holmium titanates" (2009). UNLV Theses, Dissertations, Professional Papers, and Capstones. 131.