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Quenched Fe moment in the collapsed tetragonal phase of Ca<sub>1−<i>x</i></sub>Pr<sub><i>x</i></sub>Fe<sub>2</sub>As<sub>2</sub>

Quenched Fe moment in the collapsed tetragonal phase of Ca<sub>1−<i>x</i></sub>Pr<sub><i>x</i></sub>Fe<sub>2</sub>As<sub>2</sub>

We report 75As NMR studies on single crystals of rare-earth doped iron pnictide superconductor Ca1−xPrxFe2As2. In both cases of x = 0.075, 0.15, a large increase of νq upon cooling is consistent with the tetragonal-collapsed tetragonal structure transition. A sharp drop of the Knight shift is also seen just below …