Pressure and 75As-NMR/NQR studies of iron pnictide superconductor Ba1-xKxFe2As2

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Date/Time:Wednesday, 06 Oct 2010 from 1:10 pm to 2:00 pm
Location:Room A401 Zaffarano
Phone:515-294-5630
Channel:Condensed Matter Physics
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Prof. Yoh Kohori, Department of Physics, Graduate School of Science, Chiba University, Japan

We have measured electrical resistivity under pressure P and 75As NMR on single crystal BaFe2As2 and (Ba1-xKx)Fe2As2 to elucidate mechanism of antiferromagnetic/superconducting phase transition in BaFe2As2.

This system is an antiferromagnet, AF, 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. 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. The magnetic and superconducting properties of KFe2As2 were carefully studied together with specific heat data.