Raman scattering in a Heisenberg {\boldmath S=1/2S=1/2} antiferromagnet on the triangular lattice

We investigate two-magnon Raman scattering from the $S=1/2$ Heisenberg antiferromagnet on the triangular lattice, considering both the effect of renormalization of the one-magnon spectrum by 1/S corrections and final-state magnon-magnon interactions. The bare Raman intensity displays two peaks related to one-magnon van-Hove singularities. We find that 1/S self-energy corrections to the one-magnon spectrum strongly modify this intensity profile. The central Raman-peak is significantly enhanced due to plateaus in the magnon dispersion, the high frequency peak is suppressed due to magnon damping, and the overall spectral support narrows considerably. Additionally we investigate final-state interactions by solving the Bethe-Salpeter equation to $O(1/S)$. In contrast to collinear antiferromagnets, the non-collinear nature of the magnetic ground state leads to an irreducible magnon scattering which is retarded and non-separable already to lowest order. We show that final-state interactions lead to a rather broad Raman-continuum centered around approximately twice the 'roton'-energy. We also discuss the dependence on the scattering geometry.Comment: 7 pages, 5 figure

Local Preferences and Place of Death in Regions within England 2010

This report shows public preferences for place of death in the nine English Government Office Regions (GORs), obtained from a population-based telephone survey in 2010. It compares the results with a similar survey carried out in 2003 to understand how preferences are evolving over time. It goes on to contrast these preferences with actual place of death (as reported for that region) in order to shed light on how people's wishes relate to reality and to aid care planning so that preferences are more frequently met

Palliative and End of Life Care for Black, Asian, and Minority Ethnic Groups in the UK

This report marks the start of a programme of work by many partners. A better understanding of the nation's changing demographics, of the needs of individual ethnic and cultural groups and of the types of services which will best meet their end of life care needs must be early outputs from the partnership. There are many areas which researchers will investigate further and many opportunities for service providers to work together with local communities to develop care which is sensitive and responsive to their needs as well as on a scale which will be needed for the large numbers of people who could benefi