Anomalous suppression of the orthorhombic distortion in superconducting Ba[Fe(1-x)Cox]2As2
Nandi, S. · Kim, M. G. · Kreyssig, A. · Fernandes, R. M. · Pratt, D. K. · Thaler, A. · Ni, N. · Bud'ko, S. L. · Canfield, P. C. · Schmalian, J. · McQueeney, R. J. · Goldman, A. I.
Original · EN
High-resolution x-ray diffraction measurements reveal an unusually strong response of the lattice to superconductivity in Ba[Fe(1-x)Cox]2As2. The orthorhombic distortion of the lattice is suppressed and, for Co-doping near x = 0.063, the orthorhombic structure evolves smoothly back to a tetragonal structure. We propose that the coupling between orthorhombicity and superconductivity is indirect and arises due to the magneto-elastic coupling, in the form of emergent nematic order, and the strong competition between magnetism and superconductivity.
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