Skip to ContentSkip to Navigation
About usNews and EventsNews articles

Magnetic order from molecular oxygen anions

04 May 2012

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.

Last modified:15 September 2017 3.42 p.m.
printView this page in: Nederlands

More news

  • 16 July 2019

    Thirteen Veni grants for young Groningen researchers

    Thirteen researchers from the University of Groningen (UG) and the UMCG have been awarded Veni grants within the framework of NWO’s Innovational Research Incentives Scheme. A terrific result building on last year's successes, where 12 Groningen researchers...

  • 11 July 2019

    UG to build new observatory in dark Lauwersmeer Region

    The Kapteyn Astronomical Institute of the University of Groningen is working on a concrete plan for a new observatory in the Dark Sky Park Lauwersmeer. The observatory will be placed at the Lauwersnest Activity Centre of Staatsbosbeheer in Lauwersoog...

  • 11 July 2019

    Major companies’ annual reports too vague about climate impact

    Many major Dutch companies publish extensive information about climate impact in their annual reports. However, very few companies provide concrete, detailed information about their own CO2 emissions, the impact of climate change on their business...