Tetragonal Elongation in CoO Near the Néel Point

This is the authors' abstract. We don't add key points for this paper.

Measurements of the tetragonal elongation in a CoO single crystal in the critical region above the N\'eel temperature TN indicate that |ΔLL|∝(TTN-1)ˣ, and below TN that |ΔLL|∝(1-TTN)^x^', where x=0.67±0.10 above TN and x^'=0.60±0.08 below TN. We compare these critical exponents with two theoretical predictions of strain behavior in the critical region and find agreement in both instances.