TRISP

Figure 1: Measurement of the linewidth of a dispersive excitation at TRISP: The TAS background spectrometer defines a resolution ellipsoid in the (q, ω)-space (blue ellipse), the spin-echo enhances the energy resolution within the resolution ellipsoid. Tuning of the spin-echo resolution (red line) to the group velocity of excitations is achieved by rotating the RF spin flip coils. A detailed analysis of the resolution properties is given by K. Habicht et al., J. Appl. Cryst. 36, 1307 (2003).

Figure 2: Linewidths of transverse acoustic phonons along q = (ξ, ξ , 0) in Pb at selected temperatures. Several anomalies are visible, which are not predicted by state-of-the-art ab initio calculations (gray symbols). (P. Aynajian et al., Science 319, 1510 (2008)).

Figure 3: Intrinsic magnon linewidth Γ in antiferromagnetic MnF2 at temperatures ranging from 15 to 40 K, as a function of q. We have plotted [Γ (T, q) – Γ (3 K, q)], where Γ (3 K, q) is given in the inset. (S. Bayrakci et al., Science 312, 1927 (2006))

Figure 4: Temperature dependence of magnetic and electronic contributions, a2, of the lattice constant of MnSi at various pressures measured by Larmor-diffraction. The inset displays changes of the lattice constant at ambient pressure versus T2 as normalized to a0 = 4.58Å. The relative resolution is Δd/d=1.5×10-6 (C. Pfleiderer et al, Science 316, 1510, (2008)).