NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors

Date
2015-10-15
Authors
Dioguardi, A. P.
Lawson, M. M.
Bush, B. T.
Crocker, J.
Shirer, K. R.
Nisson, D. M.
Kissikov, T.
Ran, S.
Bud’ko, Sergey
Canfield, Paul
Yuan, S.
Kuhns, P. L.
Reyes, A. P.
Grafe, H.-J.
Curro, N. J.
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Ames Laboratory
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Physics and Astronomy
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Abstract

We present 75As nuclear magnetic resonance spin-lattice and spin-spin relaxation rate data in Ba(Fe1−xCox)2As2 and Ba(Fe1−xCux)2As2 as a function of temperature, doping, and magnetic field. The relaxation curves exhibit a broad distribution of relaxation rates, consistent with inhomogeneous glassy behavior up to 100 K. The doping and temperature response of the width of the dynamical heterogeneity is similar to that of the nematic susceptibility measured by elastoresistance measurements. We argue that quenched random fields which couple to the nematic order give rise to a nematic glass that is reflected in the spin dynamics.

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This article is published as Dioguardi, A. P., M. M. Lawson, B. T. Bush, J. Crocker, K. R. Shirer, D. M. Nisson, T. Kissikov et al. "NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors." Physical Review B 92, no. 16 (2015): 165116. DOI: 10.1103/PhysRevB.92.165116. Posted with permission.

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