We use solid-state chemistry methods to identify, synthesise and characterise new materials with interesting magnetic and electronic properties. The aim is to understand the interplay between composition, structure and physical properties, and to use this to design improved functional materials.
Recent areas of interest are iron pnictide high-temperature superconductors and magnetic insulators that may exhibit magnetoelectric coupling. Other areas of interest include materials for thermoelectric power generation and refrigeration, and magnetoresistance materials.
|Iron Pnictide High-Tc Superconductors
These materials were discovered in early 2008 and are a current
hot topic in solid-state chemistry. Our work focuses on the synthesis
and characterisation of new superconductors based on tetrahedral
iron pnictide layers.
This work is aimed at designing new insulating
ferromagnetic materials that may show a large coupling between magnetism
and electric polarisation.
(Left) Crystal structure of the RFeAs(O,F) high-Tc
superconductors (R = Lanthanide). (Right) Coupled Nd/Fe spin-ordering
in the parent material NdFeAsO.
Evidence for magnetoelectric coupling in the cubic ferrimagnetic
insulator Cu2OSeO3. The peak corresponds to
a metamagnetic transition.
All research is underpinned by detailed structural investigations carried
out at the central neutron and synchrotron facilities such as ISIS and
Diamond near Oxford and the ILL and ESRF in Grenoble, France. We are
also associated with the Centre
for Science at Extreme Conditions.
SELECTED RECENT PUBLICATIONS
- Coupled spin-ordering in the Ln2LiRuO6 double perovskites, S.J. Makowski,
J.A. Rodgers, P.F. Henry, J.P. Attfield and J.W.G. Bos. Chemistry
of Materials 21, 264 (2009)
- Magnetoelectric coupling in the cubic piezoelectric ferrimagnet Cu2OSeO3,
J.W.G. Bos, C.V. Colin and T.T.M Palstra. Physical Review B 78,
- High pressure synthesis of late rare-earth RFeAs(O,F) superconductors:
R = Tb and Dy, J.W.G. Bos, G.B.S. Penny, J.A. Rodgers, D.A. Sokolov,
A.D. Huxley and J.P. Attfield. Chemical Communications, 3634
- Structures and thermoelectric properties of the infinitely adaptive
J.W.G. Bos, H.W. Zandbergen, M. Lee, N.P. Ong, and R.J. Cava. Physical
Review B 75, 195203 (2007)
- Superconductivity in CuxTiSe2, E. Morosan, H.W. Zandbergen,
B.S. Dennis, J.W.G. Bos, Y. Onose, T. Klimczuk, A.P. Ramirez, N.P. Ong
and R.J. Cava. Nature Physics 2, 544 (2006)