Abstract
The discovery of high superconducting transition temperatures in Fe‐based compounds has generated a frenzy of experimental and theoretical research activities on these systems. Whereas doping is required to establish superconductivity, careful studies of the undoped materials are important to elucidate the underlying physics. Recently, resonant ultrasound spectroscopy measurements were carried out on the undoped oxypnictide system LaFeAsO as well as the oxygen‐free systems BaFe2As2 and Ba(Fe, Co)2As2. The elastic response of the parent compounds shows a very gradual softening corresponding to the structural transition that characterizes these systems. Remarkably, this softening persists in the superconducting samples, even though the structural transition in these compounds is suppressed.
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