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Stimuli responsive polymersomes: Small Angle Neutron Scattering studies
May 27 14:30 - 15:30
- Diblock copolymers can self-assemble in solution in stable and robust polymersomes (vesicles),...
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To deuterate or not to deuterate? That is the question
June 03 14:30 - 15:30
- Accepted wisdom when performing diffraction experiments with neutrons is to deuterate the...
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Static and dynamic properties of a strong-leg spin-ladder
June 17 14:30 - 15:30
- The AF S = 1/2 Heisenberg spin ladder belongs to the simplest quantum magnets, yet disclosing the...
Neutrons change theory about new data storage systems
Data measured at the high resolution spectrometer TRISP at the neutron source FRM II contradict a theory about one-dimensional spin ladders. The results have been published in Physical Review Letters online.
Discrepancy between theory (red dotted line) and new data from TRISP (red dots).
The properties of new data storage systems for highly efficient computers are based on magnetism. A basic knowledge of these properties is gained by examining simple model systems, like the one-dimensional spin ladders. The scientists led by Balint Nafradi examined a spin ladder in the thermal neutron beam of the spectrometer TRISP. The spectrometer can enhance the energy resolution by about two orders of magnitude by taking advantage of the Larmor precession of neutron spins.
The results of the scientists from Max-Planck-Institut für Festkörperforschung, the Kogoshima University in Japan and the Laboratory for Solid State Physics in Zürich show a great discrepancy in comparison to the existing theory about the properties of the spin ladder. They help to better understand these important materials.
Original publication:
Low-Temperature Dynamics of Magnons in a Spin-1/2 Ladder Compound,
B. Náfrádi, T. Keller, H. Manaka, A. Zheludev and B. Keimer,
Physical Review Letters, 106, 177202 (2011), DOI: 10.1103/PhysRevLett.106.177202
