X-ray and neutron scattering

Abstract:

Two programs designed to demonstrate vibrations of a linear 1-dimensional chain and a 2-dimensional array. These programs are useful for teaching to undergraduates typically in a Condensed Matter lecture course.

Abstract:

The magnetic ground state of a single crystalline bilayered manganite La1.1Sr1.9Mn2O7 is investigated using bulk magnetic measurements. Besides large relaxation times, memory effects reminiscent of that seen in spin glasses are also observed both in the field cooled and zero field cooled measurement protocols. These indicate that this system is not a canted antiferromagnet as was reported earlier, but on the contrary has an inhomogenous magnetic ground state arising as a consequence of phase separation. We also report the observation of sharp metamagnetic steps in this bilayered manganite, similar to that seen in phase separated three-dimensional perovskites.

Abstract:

SUMO REFINE Home - VIBRATE! - Chains - MEGAW - WinDicVol - WinOptact - Maths - Downloads - Comments VIBRATE! is a program, written by Professor Mike Glazer (Oxford University) to run on Microsoft Windows, in order to compute the irreducible representations for normal modes of vibration and magnetic modes directly from a crystal structure using Factor Group Analysis. The default is to carry out the analysis for modes at the centre of the Brillouin Zone (k = 0) and as such is ideal for spectroscopy applications such as Raman or Infra-Red Spectroscopy. Operation of the program is very simple. It is first necessary to input the crystal structure and once this is done the program automatically computes the rest.