PhD ceremony: Mr. S. Riyadi, 11.00 uur, Academiegebouw, Broerstraat 5, Groningen
Dissertation: Magnetic order from molecular oxygen anions
Promotor(s): prof. T.T.M. Palstra, prof. R.A. de Groot
Faculty: Mathematics and Natural Sciences
The magnetic properties of alkali metal oxide compounds, which are determined by the behavior of molecular oxygen species, are investigated with a view to their potential as new spintronics materials.
Spintronics is an emerging technology in which solid-state devices use not only the charge of the electron, but also its spin and the magnetic moment associated with it. Since oxygen is a light element, alkali oxides might offer advantages over materials that are used in today’s technology.
The oxygen molecule (O2) is important for living creatures. Apart from this, oxygen is also interesting for the condensed-matter physicist because it is a magnetic molecule. Oxygen solidifies below 54.36 K (-218.79 ° C) and shows many interesting physical phenomena below this temperature. For example, it has been reported that oxygen is superconducting below 0.6 K at high pressure (100 GPa).
Different types of oxygen species, oxide (O2-), peroxide (O2 2-), and superoxide (O2 -), can be formed when molecular oxygen chemically bonds with alkali metals such as potassium (K), rubidium (Rb), and cesium (Cs). These species can give rise to a wide range of interesting physical properties.
The thesis discusses three main topics: 1) exploring the chemical synthesis and properties of new chemical phases of rubidium oxides (RbOx); 2) ferromagnetic order driven by superoxide ions in RbO1.66; 3) one-dimensional antiferromagnetic spin-chain order formed by superoxide ions in CsO2.
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