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The lattice dynamic response of body-centered tetragonal β−Sn (I41/amd) under high pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering is used to map the phase stability region of β−Sn to perform mode Grüneisen analysis, and we demonstrate the necessity of an optical intensity calibration for Raman thermometry. The Grüneisen tensor is evaluated along a set of isotherms to address shortcomings of single-mode Grüneisen parameters with respect to anisotropic deformations of this tetragonal structured soft metal. The changes observed here in the Grüneisen tensor as a function of temperature are related to anharmonicity and denote potential criteria for the onset of premelting.
Atomic, Molecular and Optical Physics
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Hinton, J. K.,
Ellison, P. B.,
Lawler, K. V.,
Response of the Mode Grüneisen Parameters With Anisotropic Compression: A Pressure and Temperature Dependent Raman Study of β-Sn.
Physical Review, 102