75As NMR on Ba0.234K0.766Fe2As2 shows a pseudogap below T* of about 12 K above Tc and no spin-fluctuation enhancement at T_c^Z2, indicating the time-reversal-symmetry-broken state is nonmagnetic.
The obtained c- axis parameter corresponds to x = 0.766(1) [40], indicating that the doping level is the same within 0.1% for both sides of the sample
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Evidence of pseudogap and absence of spin magnetism in the time-reversal-symmetry-breaking state of Ba$_{1-x}$K$_x$Fe$_2$As$_2$
75As NMR on Ba0.234K0.766Fe2As2 shows a pseudogap below T* of about 12 K above Tc and no spin-fluctuation enhancement at T_c^Z2, indicating the time-reversal-symmetry-broken state is nonmagnetic.