Charge density waves in the low-dimensional compounds AxNb3Te4 with A = Ag, Ga, Zn,0
LE3 .A278 2018
Bachelor of Science
Some metals when they are cooled to low temperatures do not have a uniform charge distribution. In these metals, the electron charge density varies in a wave-like fashion, referred to as a charge density wave (CDW). Charge density waves are a coupled modulation of the conduction electron density and the host lattice structure that occurs primarily in low-dimensional compounds. The characteristics of CDWs are not fully understood. Nb3Te4 is a transition metal compound with spacious hexagonal tunnels that exhibits a CDW transition at 110 K. To investigate the CDW transition in Nb3Te4, silver, gallium, or zinc atoms are inserted into these tunnels, a process known as intercalation. Intercalation does not produce significant changes in theNb3Te4 structure; however through the transfer of electrons, intercalation does affect the CDW transition. The effect of intercalate concentration on the properties of the CDW in Nb3Te4 was investigated using resistivity measurements, X-ray energy dispersive spectroscopy and X-ray diffraction. It was observed that intercalation suppresses the CDW onset temperature for all three intercalates; however, due to limited intercalation under the experimental conditions used, no clear correlation of onset temperature with intercalate concentration could be established.
The author grants permission to the University Librarian at Acadia University to reproduce, loan or distribute copies of my thesis in microform, paper or electronic formats on a non-profit basis. The author retains the copyright of the thesis.