Abstract
The combination of two traditional neutron techniques—three-axis spectroscopy and spin-echo spectroscopy—opens access to experimental studies of weak anharmonic effects in lattice dynamics, such as thermal variation of phonon frequencies and their natural line widths in crystals far from structural phase transitions. The present paper summarizes the most important features of the technique and illustrates them by data obtained in the course of a recent study of phonon anharmonicity and isotopic disorder effects in germanium single crystals.
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