Abstract
We have measured electrical resistivity under pressure P and 75As NMR on single crystal and poly crystalline BaFe2As2 and (Ba1−xKx)Fe2As2 to elucidate mechanism of antiferromagnetic/superconducting phase transition in BaFe2As2. This system is an antiferromagnet, AF, with a transition temperature of 141 K, which shows superconductivity by applying P or by a carrier doping of K for Ba. From high P resistivity measurements, we understood that the transition was highly sensitive to the P homogeneity. Small uniaxial stress strongly suppresses AF order and stabilizes superconductivity at much lower pressure. 75As NMR study in (Ba1−xKx)Fe2As2 shows existence of large AF spin fluctuations in tetragonal phase having a superconducting ground state. The AF spin fluctuations decrease gradually with increasing K concentration.
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