MLZ User Meeting 2019

High-resolution spectroscopy and diffraction at TRISP

11 Dec 2019, 13:30

3h

Marriott Conference room - Munich (Marriott)

Board: 02

Poster Quantum Phenomena Poster session

Speaker

Dr Thomas Keller (MPI for Solid State Research)

Description

We present the capabilities of TRISP both for high-resolution spectroscopy and diffraction and show typical experimental examples. TRISP is a thermal three axis spectrometer incorporating the resonant spin-echo technique. Typical applications include the measurement of linewidths of phonons and spin excitations in an energy range 0.5-50meV, and the energy width of quasi-elastic scattering, originating, for example, from critical magnetic fluctuations. Neutron Larmor diffraction is a high-resolution technique which permits the measurement of lattice spacings $d_{hkl}$ and their distribution $\mathrm{\Delta }{d}_{hkl}$. The latter arises, for example, from micro-strains, magnetostriction, structural and magnetic domains, or from a small splitting of Bragg peaks, resulting from distortions of the crystal lattice. The resolution of Larmor diffraction at TRISP is ${10}^{-6}$ (relative) for the lattice spacing and one order of magnitude less for the distribution width.