University
of California, Davis
Physics
Department
Condensed
Matter Seminar
"
Designer Diamond Anvils: A Novel Technique for Electrical Transport and AC
Susceptibility Measurements"
Using Designer Diamond Anvil Cells, the experimental
capabilities of a diamond anvil cell is expanded to include a simple technique
for 4-probe electrical resistivity measurements, as well as sensitive AC
magnetic susceptibility measurements. These designer diamond anvils
consist of tungsten wires deposited on the diamond tip, followed by epitaxial
diamond deposition in order to electrically insulate the tungsten circuit from
the metallic gasket. We can now measure the electrical and magnetic properties
of materials from room temperature down to 15 K, and up to megabar
pressures. The development and fabrication of designer diamond anvils
will be presented, as well as the recent results including the magnetic and
electrical resistivity properties of Gd up to 70 GPa, and the first direct
evidence of the Mott-insulator transition found in MnO at 95 GPa.
4:10 p.m., 416 Phy/Geo