TY  - INPR
A1  - Böhmer, Anna Elisabeth
A1  - Chen, Fei
A1  - Meier, William R.
A1  - Xu, Mingyu
A1  - Drachuck, Gil
A1  - Merz, Michael
A1  - Wiecki, Paul W.
A1  - Bud’ko, Sergey L.
A1  - Borisov, Vladislav
A1  - Valentí, Roser
A1  - Christensen, Morten H.
A1  - Fernandes, Rafael M.
A1  - Meingast, Christoph
A1  - Canfield, Paul C.
T1  - Evolution of nematic fluctuations in CaK(Fe1−xNix)4As4 with spin-vortex crystal magnetic order
T2  - arXiv
N2  - The CaK(Fe1−xNix)4As4 superconductors resemble the archetypal 122-type iron-based materials but have a crystal structure with distinctly lower symmetry. This family hosts one of the few examples of the so-called spin-vortex crystal magnetic order, a non-collinear magnetic configuration that preserves tetragonal symmetry, in contrast to the orthorhombic collinear stripe-type magnetic configuration common to the 122-type systems. Thus, nematic order is completely absent from its phase diagram. To investigate the evolution of nematic fluctuations in such a case, we present elastoresistance and elastic modulus measurements in CaK(Fe1−xNix)4As4 (x=0−0.05) combined with phenomenological modeling and density functional theory. We find clear experimental signatures of considerable nematic fluctuations, including softening of the Young's modulus Y[110] and a Curie-Weiss type divergence of the B2g elastoresistance coefficient in CaK(Fe0.951Ni0.049)4As4. Overall, nematic fluctuations within this series bear strong similarities to the hole-doped Ba1−xKxFe2As2 series, including a substitution-induced sign change. Our theoretical analysis addresses the effect of the specific crystal symmetry of the 1144-type structure in determining its magnetic ground state and on the nematic fluctuations.
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/82366
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-823662
UR  - https://arxiv.org/abs/2011.13207v1
IS  - 2011.13207 Version 1
PB  - arXiv
ER  -