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The static and the dynamic spin correlations in the low temperature collapsedtetragonal and the high temperature tetragonal phase in CaFe2As2 have beeninvestigated by 75As nuclear magnetic resonance (NMR) and nuclear quadrupoleresonance (NQR) measurements.  Through the temperature (T) dependence of the nuclear spin lattice relaxationrates (1/T1) and the Knight shifts, although stripe-type antiferromagnetic(AFM) spin correlations are realized in the high temperature tetragonal phase,no trace of the AFM spin correlations can be found in the non-superconducting,low temperature, collapsed tetragonal (cT) phase.  Given that there is no magnetic broadening in 75As NMR spectra, together withthe T-independent behavior of magnetic susceptibility (x) and the T dependenceof 1/T1Tx, we conclude that Fe spin correlations are completely quenchedstatically and dynamically in the non-superconducting cT phase in CaFe2As2.

physical review. b, condensed matter and materials physics

The suppression of electron correlations in the collapsed tetragonal  phase of CaFe2As2 under ambient pressure demonstrated by 75As NMR-NQR  measurements