Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Superconductivity: Fe-based Superconductors - 122 and Theory
TT 35.3: Vortrag
Dienstag, 13. März 2018, 10:00–10:15, A 053
Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe2As2 — T. Kissikov1, •R. Sarkar2, S. L. Bud’ko3, P. C. Canfield3, R. M. Fernandes4, and N. J. Curro2 — 1Department of Physics, UC Davis, CA 95616, USA — 2Institute of Solid State and Materials Physics, TU Dresden, 01062 Dresden, Germany — 3Ames Laboratory Department of Physics and Astronomy,ISU Ames, Iowa 50011, USA — 4School of Physics and Astronomy, UMN Minneapolis, Minnesota 55455, USA
The iron-based high temperature superconductors exhibit a rich phase diagram reflecting a complex interplay between spin, lattice, and orbital degrees of freedom. The nematic state observed in many of these compounds illustrates this complexity, by entangling a real-space anisotropy in the spin fluctuation spectrum with ferro-orbital order and an orthorhombic lattice distortion. A more subtle and much less explored fact of the interplay between these degrees of freedom arises from the sizable spin-orbit coupling present in these systems, which translates anisotropies in real space into anisotropies in spin space. Here, we present a new technique enabling nuclear magnetic resonance under precise tunable strain control, which reveals that upon application of a tetragonal symmetry-breaking strain field, the magnetic fluctuation spectrum in the paramagnetic phase of BaFe2As2 also acquires an anisotropic response in spin-space.