Wouter Montfrooij
Assistant Professor of Physics
UMC

 		Wouter Montfrooij      
Office: 418 Physics Building
Phone: 573-882-8362
E-mail: montfrooijW@missouri.edu
Webpage: http://web.missouri.edu/~montfrooijw/
Biographical Information: Ph.D., University of Delft, 1990


Research Interests

Neutron Scattering

My main research interest is the study of phase transitions in condensed matter. Of particular interest are phase transitions in which the ordered phase does not occur until zero Kelvin, the so-called quantum phase transitions. These transitions are different from 'classical' phase transitions in the sense that quantum fluctuations are more important than thermal fluctuations, resulting in a new type of ordering behavior. These transitions are primarily studied by means of neutron scattering experiments, and by susceptibility and transport measurements.  

Also, I research magnetic moments in liquid metals, the superfluid phase of liquid helium (a phase in which the fluid has zero viscosity), and the magnetic properties of spinel structures, such as magnetite (better known as lodestone). Follow the above webpage link for details, and (p)reprints

Selected Publications

W. Montfrooij, P. Verkerk and I.M de Schepper. Approach to ideal-gas behavior in dense classical fluids. Phys. Rev. A33 (1986) 540.

W. Montfrooij, P. Westerhuijs, V.O. de Haan and I.M de Schepper. Fast sound in a helium-neon mixture determined by neutron scattering. Phys. Rev. Lett. 63 (1989) 544.

W. Montfrooij, I.M de Schepper, L.A de Graaf, A.K. Soper and W.S. Howells. Direct determination of the helium interatomic core potential by neutron scattering. J. Phys.: Cond. Matt. 2 (1990) 2431.

W. Montfrooij and I.M. de Schepper. Relationship between the roton minimum and T-lambda in 4He. Phys. Rev. B51 (1995) 15607.

E.C. Svensson, W. Montfrooij and I.M de Schepper. Disappearance of roton propagation in superfluid 4He at T-lambda. Phys. Rev. Lett. 77 (1996) 4398.

W. Montfrooij, R.L. McGreevy, R. Hadfield and N.H. Andersen. Reverse Monte Carlo analysis of powder patterns. Journ. of Appl. Cryst. 29 (1996) 285.

W. Montfrooij, E.C. Svensson, I.M de Schepper and E.G.D. Cohen. Effective eigenmode description of normal- and superfluid helium. Journ. of Low. Temp. Phys. 109 (1997) 577.

W. Montfrooij, E.C. Svensson. Superfluid 4He: Just a very cold liquid?  Journ. of Low. Temp. Phys. 121 (2000) 293.

W. Montfrooij, M. C. Aronson, B. D. Rainford, J. A. Mydosh, A.P. Murani, P. Haen, and T. Fukuhara, Extended versus Local Fluctuations in Quantum Critical Ce(Ru1-xFex)2Ge2 (x=xc=0.76). Phys. Rev. Lett. 91 (2003) 087202.

Mark Patty, Keary Schoen and Wouter Montfrooij, Fluctuating magnetic moments in liquid metals, Phys. Rev. E 73, 021202 (2006).