Nematic Susceptibility of Hole-Doped and Electron-Doped BaFe2As2 Iron-Based Superconductors from Shear Modulus Measurements

作者：Boehmer A E; Burger P; Hardy F; Wolf T; Schweiss P; Fromknecht R; Reinecker M; Schranz W; Meingast C

来源：Physical Review Letters, 2014, 112(4): 047001.

DOI：10.1103/PhysRevLett.112.047001

The nematic susceptibility, chi(phi), of hole-doped Ba1-xKxFe2As2 and electron-doped Ba(Fe1-xCox)(2)As-2 iron-based superconductors is obtained from measurements of the elastic shear modulus using a three-point bending setup in a capacitance dilatometer. Nematic fluctuations, although weakened by doping, extend over the whole superconducting dome in both systems, suggesting their close tie to superconductivity. Evidence for quantum critical behavior of chi(phi) is, surprisingly, only found for Ba(Fe1-xCox)(2)As-2 and not for Ba1-xKxFe2As2-the system with the higher maximal T-c value.

• 出版日期2014-1-28