Abstract
The resonant frequency and Q of the acoustic modes of YIG and YAG have been investigated as a function of temperature at approximately 1 Mc/sec. The samples studied have either Mn or Ni additions in the range from 0 to 1% of the total weight. For the samples with Mn or Ni additions, the resonant frequency of the shear modes has a maximum as a function of temperature. This maximum does not exist with pure YIG and YAG. The Mn or Ni additions also lead to a large increase in the low-temperature acoustic loss. Similar results have been obtained with Mn additions in the corundum and spinel structures. We tentatively attribute the observed effects to the static and dynamic Jahn—Teller distortions arising from the Mn and Ni additions.
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