NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe1−xCox)2As2

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Kissikov, T.
Dioguardi, A. P.
Timmons, Erik
Tanatar, Makariy
Prozorov, Ruslan
Bud’ko, Sergey
Fernandes, R. M.
Curro, N. J.
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Canfield, Paul
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Ames National Laboratory

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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(Fe1−xCox )2As2 with x = 0.048. The anisotropy reaches a maximum of 30% at TN, 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.


This article is published as Kissikov, T., A. P. Dioguardi, E. I. Timmons, M. A. Tanatar, R. Prozorov, S. L. Bud'ko, P. C. Canfield, R. M. Fernandes, and N. J. Curro. "NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe1−xCox)2As2." Physical Review B 94, no. 16 (2016): 165123. DOI: 10.1103/PhysRevB.94.165123. Posted with permission.

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Fri Jan 01 00:00:00 UTC 2016