Origin of the Resistivity Anisotropy in the Nematic Phase of FeSe.
The in-plane resistivity anisotropy is studied in strain-detwinned single crystals of FeSe. In contrast to other iron-based superconductors, FeSe does not develop long-range magnetic order below the tetragonal-to-orthorhombic transition at T_{s}≈90  K. This allows for the disentanglement of the contributions to the resistivity anisotropy due to nematic and magnetic orders. Comparing direct transport and elastoresistivity measurements, we extract the intrinsic resistivity anisotropy of strain-free samples. The anisotropy peaks slightly below T_{s} and decreases to nearly zero on cooling down to the superconducting transition. This behavior is consistent with a scenario in which the in-plane resistivity anisotropy is dominated by inelastic scattering by anisotropic spin fluctuations.
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
M A
MA
Tanatar
Ames Laboratory, Ames, Iowa 50011, USA.
A E
AE
Böhmer
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
E I
EI
Timmons
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
M
M
Schütt
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
G
G
Drachuck
Ames Laboratory, Ames, Iowa 50011, USA.
V
V
Taufour
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
K
K
Kothapalli
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
A
A
Kreyssig
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
S L
SL
Bud'ko
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
P C
PC
Canfield
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
R M
RM
Fernandes
Ames Laboratory, Ames, Iowa 50011, USA.|Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
R
R
Prozorov