Zener double exchange from local valence fluctuations in magnetite (2007)
McQueeney, R. J., Yethiraj, M., Chang, S., Montfrooij, W., Perring, T. G., Honig, J., ...
Magnetite (Fe$_{3}$O$_{4}$) is a mixed valent system where electronic conductivity occurs on the B-site (octahedral) iron sublattice of the spinel structure. Below $T_{V}=122$ K, a metal-insulator...
The ground state of a quantum critical system: Neutron scattering on Ce(Ru1-xFex)2Ge2. (2007)
Montfrooij, W., Lamsal, J., Aronson, M.C., Bennett, M., Visser, A. De, Huang, Y., ...
McQueeney, R. J., Yethiraj, M., Montfrooij, W., Gardner, J. S., Metcalf, P., Honig, J.
Inelastic neutron scattering results on magnetite (Fe3O4) show a large splitting in the acoustic spin wave branch, producing a 7 meV gap midway to the Brillouin zone boundary at q = (0,0,1/2) and E =...
Non-Fermi-liquid behavior in Ce(Ru1-xFex)2Ge2: cause and effect (2006)
Montfrooij, W., Aronson, M.C., Rainford, B.D., Mydosh, J.A., Hendrikx, R.W.A., Gortenmulder, T.J., ...
Non-Fermi-liquid behavior in Ce(Ru$_{1-x}$Fe$_x$)$_2$Ge$_2$: cause and effect (2005)
Montfrooij, W., Aronson, M. C., Rainford, B. D., Mydosh, J. A., Hendrikx, R., Gortenmulder, T., ...
We present inelastic neutron scattering measurements on the intermetallic compounds Ce(Ru$_{1-x}$Fe$_x$)$_2$Ge$_2$ ($x$=0.65, 0.76 and 0.87). These compounds represent samples in a magnetically...
Montfrooij, W., Aronson, M.C., Rainford, B.D., Mydosh, J.A., Hendrikx, R., Gortenmuller, T., ...
We present inelastic neutron scattering measurements on the heavy-fermion compound Ce(Ru1–xFex)2Ge2 (x=0.87). This composition is close to the quantum critical point (QCP) compound (x=0.76) in...
The Role of Grain Boundaries in Determining the Transport Properties in Magnetite (2004)
Mertens, David C., Montfrooij, W., McQueeney, R. J., Yethiraj, M., Honig, J. M.
We present magnetoresistance and Hall-effect measurements on single crystal magnetite Fe3O4 close to the Verwey transition Tv = 123.8 K. We show that the formation of grain boundaries accompanying...
Extended versus local fluctuations in quantum critical Ce(Ru1-xFex)2Ge2 (x=xc=0.76) (2003)
Montfrooij, W., Aronson, M.C., Rainford, B.D., Mydosh, J.A., Murani, A.P., Haen, P., ...
We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum critical point in Ce(Ru0.24Fe0.76)2Ge2. Both local and long-range fluctuations of the local moments...
Cage diffusion in liquid mercury (2003)
Badyal, Y. S., Bafile, U., Miyazaki, K., De Schepper, I. M., Montfrooij, W.
We present inelastic neutron scattering measurements on liquid mercury at room temperature for wave numbers $q$ in the range 0.3 $< q
Cage diffusion in liquid mercury (2003)
Badyal, Y S, Bafile, U, Miyazaki, K, De Schepper, I M, Montfrooij, W
Extended versus local fluctuations in quantum critical Ce(Ru1-xFex)2Ge2 (x = xc = 0.76) (2003)
Montfrooij, W., Aronson, M.C., Rainford, B.D., Mydosh, J.A., Murani, A.P., Haen, P., ...
We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum critical point in Ce(Ru0.24Fe0.76)2Ge2. Both local and long-range fluctuations of the local moments...
Cage diffusion in liquid mercury (2003)
Badyal, Y.S., Bafile, U., Miyazaki, K., D. Schepper, I.M., Montfrooij, W.
non-Local Quantum Criticality in Ce(Ru_{1-x} Fe_x)_2 Ge_2 (x = x_c = 0.76) (2002)
Montfrooij, W., Aronson, M. C., Rainford, B. D., Mydosh, J. A., Murani, A. P., Haen, P., ...
We present the results of inelastic neutron scattering measurements, performed near the antiferromagnetic quantum critical point in Ce(Ru_{0.24} Fe_{0.76})_2 Ge_2. Both local and long range...
Neutron scattering investigation of the spin dynamics in Li[Mn1.94Li0.04]O3.94 (2001)
Schimmel, H.G., Montfrooij, W., Kearley, G.J., Verhoeven, V.W.J., De Schepper, I.M.
Neutron scattering investigation of the spin dynamics in Li[Mn1.94Li0.04]O3.94 (2001)
Schimmel, H.G., Montfrooij, W., Kearley, G.J., Verhoeven, V.W.J., De Schepper, I.M.
Dimensional crossover in the XY-compound YBa2Cu3O6+x (1998)
Montfrooij, W, Casalta, H, Schleger, P, Andersen, NH, Zhokov, AA, Christensen, AN
Effective eigenmode description of normal and superfluid helium (1997)
Montfrooij, W, Svensson, E C, De Schepper, I M, Cohen, E G D
Multiexcitation scattering by superfluid 4He (1996)
Crevecoeur, R M, Smorenburg, H E, De Schepper, I M, Montfrooij, W, Svensson, E C
Angular and time resolution of neutron time of flight spectrometers (1995)
Crevecoeur, R M, De Schepper, I M, De Graaf, L A, Montfrooij, W, Svensson, E C, Carlile, C J
Overdamped phonons in fluid helium at 4 K (1995)
Crevecoeur, R.M., Verberg, R., De Schepper, I.M., De Graaf, L.A., Montfrooij, W.
Fast and slow sound in a dense gas mixture of helium and neon (1992)
Westerhuijs, P, Montfrooij, W, De Graaf, L A, De Schepper, I M
Fast and slow sound in a dense gas mixture of helium and neon (1992)
Westerhuijs, P., Montfrooij, W., De Graaf, L.A., De Schepper, I.M.
Density and temperature dependence of the structure factor of dense fluid helium (1991)
Montfrooij, W, De Graaf, L A, Van Der Bosch, P J, Soper, A K, Howells, W S