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VOLUME 40 (1984) | ISSUE 1 | PAGE 20
Anomalies in the propagation of heat pulses in solid solutions of yttrium-rare-earth-aluminum garnets
The propagation of nonequilibrium phonons is predominantly a diffusive propagation in garnets in which the atomic concentration of yttrium and the rare-earth metals Lu, Yb, and Dy exceeds 5% (the atoms of yttrium and those of these rare-earth metals can substitute for each other). At a rare-earth-metal concentration ^25% there is an anomalous increase in the mean free path of nonequilibrium phonons, whose propagation may become ballistic.