Abstract
A specific microstructural model involving short- or long-range order of (Ba,Sr${)}_{[\mathrm{La}]}$ dopant substituents explains the composition ${\mathit{x}}_{0}$=0.125 most favorable for the formation of the low-temperature ${\mathrm{Ba}}_{[\mathrm{La}]}$ tetragonal phase. The microstructural model shows that the normal state of these alloys can be described as a two-component Fermi liquid in order to explain the acoustic, magnetic, and thermal anomalies centered on ${\mathit{x}}_{0}$ as well as the related drastic reduction in ${\mathit{T}}_{\mathit{c}}$ over a narrow range of x.
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