Dr Peter Vorderwisch

Consultant to the SIKA project

Phone +61 (0)2 9717 7270
Email Peter.Vorderwisch@ansto.gov.au

Dr Peter Vorderwisch provides advice on the construction of the Taiwanese cold-neutron 3-Axis-Spectrometer SIKA at the new OPAL reactor

His areas of expertise include condensed matter physics, using inelastic neutron scattering. Lattice dynamics, magnetic excitations, crystal-field transitions, molecular motions, structural and dynamical aspects of the martensitic transformation in ferromagnetic shape-memory alloys.

Peter comes from the Hahn-Meitner Institute in Berlin where he worked for more than 40 years in neutron physics. He has also spent time as a EURATOM research fellow at the Belgian Nuclear Research Centre S.C.K./C.E.N. Mol (1970-1972) and as a visiting scientist at the Los Alamos National Laboratory in the United States (1985-1988).

Qualifications and achievements:

• Team member in a project to upgrade the Berlin research reactor BER-2, contributing to the reactor safety analysis and coordinating the installation of the new neutron scattering instrumentation
• Instrument scientist to develop, construct and operate the cold-neutron 3-Axis-Spectrometer FLEX, which became an instrument highly demanded by users of the Berlin Neutron Scattering Centre (BENSC).

Key Publications

S.M. Shapiro, P. Vorderwisch, K. Habicht, K. Hradil and H. Schneider, "Observation of phasons in magnetic shape memory alloy Ni₂MnGa", Europhys. Lett. (in press)

P. Vorderwisch and S. M. Shapiro, "Phonon dispersion in the ferromagnetic shape memory alloy Ni₂MnGa studied by neutron spectroscopy", Mat. Sci. Eng. A 438-440, 450-453 (2006)

M. B. Stone, C. Broholm, D. H. Reich, P. Vorderwisch, O. Tchernyshyov and N. Harrison, "Quantum criticality in an organic magnet", Phys. Rev. Lett. 96, 257203/1-4 (2006).

B. Lake, K. Lefmann, N. B. Christensen, G. Aeppli, D. F. McMorrow, H. M. Ronnow, P. Vorderwisch, P. Smeibidl, N. Mangkorntong, T. Sasagawa, M. Nohara and H. Takagi, "Three-dimensionality of field-induced magnetism in a high-temperature superconductor", Nature Materials 4, 658-662 (2005)

M. Hagiwara, L.-P. Regnault, A. Zheludev, A. Stunault, N. Metoki, T. Suzuki, S. Suga, K. Kakurai, Y. Koike, P. Vorderwisch and J.-H. Chung, "Spin excitations in an anisotropic bond-alternating quantum S=1 chain in a magnetic field: contrast to Haldane spin chains", Phys. Rev. Lett. 94, 177202/1-4 (2005)

A. Zheludev, S.M. Shapiro, Z. Honda, K. Katsumata, B. Grenier, E. Ressouche, L. P. Regnault, Y. Chen, P. Vorderwisch, H.-J. Mikeska and A.K. Kolezhuk, "Dynamics of an anisotropic Haldane antiferromagnet in a strong magnetic field", Phys. Rev. B 69, 054414/1-10 (2004)

P. Vorderwisch, O. Sobolev and A. Desmedt, "NH₃ quantum rotators in Hofmann clathrates: intensity and width of rotational transition lines", Physica B 350, e391-e393 (2004)

Ch. R?egg, N. Cavadini, A. Furrer, H.-U. G?del, K. Kr?mer, H. Mutka, A. Wildes, K. Habicht and P. Vorderwisch, "Bose-Einstein condensation of the triplet states in the magnetic insulator TlCuCl₃", Nature 423, 62-65 (2003)

B. Khaykovich, R. J. Birgeneau, F. C. Chou, R. W. Erwin, M. A. Kastner, S.-H. Lee, Y. S. Lee, P. Smeibidl, P. Vorderwisch and S. Wakimoto, "Effect of a magnetic field on long-range magnetic order in stage-4 and stage-6 superconducting La₂CuO₄+y", Phys. Rev. B 67, 054501/1-6 (2003)

B. Lake, H. M. Ronnow, N. B. Christensen, G. Aeppli, K. Lefmann, D. F. McMorrow, P. Vorderwisch, P. Smeibidl, N. Mangkorntong, T. Sasagawa, M. Nohara, H. Takagi and T. E. Mason, "Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor", Nature 415, 299-302 (2002)