Article ID Journal Published Year Pages File Type
1594059 Solid State Communications 2010 4 Pages PDF
Abstract
The CRESST experiment looks for evidence of dark matter particles colliding with nuclei in CaWO4, using cryogenic bolometers sensitive to energy deposition (∼10 keV) with high accuracy. Calibration of the energy deposited in the phonon system depends upon the details of the evolution of the non-equilibrium energy in the CaWO4 absorber. Phonon images sensitively reveal variations in angular phonon flux in a single-crystal sample and provide accurate data for the group velocity along non-symmetry directions. Our measurements, over a wide range of propagation angles, provide new and precise values for phonon group velocities and uncover significant discrepancies between the experimentally observed transport of non-equilibrium energy and that predicted using values of the low-temperature elastic constants widely cited in the literature.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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