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

A. P. Dioguardi; M. M. Lawson; B. T. Bush; J. Crocker; K. R. Shirer; D. M. Nisson; T. Kissikov; S. Ran; S. L. Bud'ko; P. C. Canfield; S. Yuan; P. L. Kuhns; A. P. Reyes; H. -J. Grafe; N. J. Curro

doi:10.1103/PhysRevB.92.165116

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

Strongly Correlated Electrons 2015-10-21 v2

Authors: A. P. Dioguardi , M. M. Lawson , B. T. Bush , J. Crocker , K. R. Shirer , D. M. Nisson , T. Kissikov , S. Ran , S. L. Bud'ko , P. C. Canfield , S. Yuan , P. L. Kuhns , A. P. Reyes , H. -J. Grafe , N. J. Curro

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Abstract

We present $^{75}$ As nuclear magnetic resonance spin-lattice and spin-spin relaxation rate data in Ba(Fe $_{1-x}$ Co $_x$ ) $_2$ As $_2$ and Ba(Fe $_{1-x}$ Cu $_x$ ) $_2$ As $_2$ 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.

Keywords

iron arsenide superconductors nematic fluctuations nuclear magnetic resonance inhomogeneous glassy behavior dynamical heterogeneity elastoresistance quenched random fields

Cite

@article{arxiv.1503.01844,
  title  = {NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors},
  author = {A. P. Dioguardi and M. M. Lawson and B. T. Bush and J. Crocker and K. R. Shirer and D. M. Nisson and T. Kissikov and S. Ran and S. L. Bud'ko and P. C. Canfield and S. Yuan and P. L. Kuhns and A. P. Reyes and H. -J. Grafe and N. J. Curro},
  journal= {arXiv preprint arXiv:1503.01844},
  year   = {2015}
}

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Accepted to Physical Review B

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

Abstract

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