NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

We report the experimental details of how mechanical detwinning can be implemented in tandem with high sensitivity nuclear magnetic resonance measurements and use this setup to measure the in-plane anisotropy of the spin-lattice relaxation rate in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ with $x=0.048$. The anisotropy reaches a maximum of 30\% at $T_N$, and the recovery data reveal that the glassy behavior of the spin fluctuations present in the twinned state persist in the fully detwinned crystal. A theoretical model is presented to describe the spin-lattice relaxation rate in terms of anisotropic nematic spin fluctuations.

arXiv comment8 pages, 4 figures

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Cited by in corpus (10)

• Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe${}_2$As${}_2$
• Local nematic susceptibility in stressed BaFe${}_2$As${}_2$ from NMR electric field gradient measurements
• Iron-based superconductors: tales from the nuclei
• Nuclear Magnetic Resonance Probe Head Design for Precision Strain Control
• Effect of proton irradiation on the normal state low-energy excitations of Ba(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$ superconductors
• Coexistence of antiferromagnetic and ferromagnetic spin correlations in Ca(Fe1-xCox)2As2 revealed by 75As nuclear magnetic resonance
• Superconductivity with Tc=7 K under pressure for Cu-, and Au-doped BaFe2As2
• Mapping out the spin fluctuations in Co-doped LaFeAsO single crystals by NMR
• Divergence of the quadrupole-strain susceptibility of YbRu${}_2$Ge${}_2$; a local moment realization of electronic nematicity
• Nuclear magnetic resonance studies in a model transverse field Ising system