Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors

L. Bossoni; M. Moroni; M. H. Julien; H. Mayaffre; P. C. Canfield; A. Reyes; W. P. Halperin; P. Carretta

doi:10.1103/PhysRevB.93.224517

paper

Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors

arXiv:1602.01710 · doi:10.1103/PhysRevB.93.224517

Abstract

We present nuclear magnetic resonance evidence that very slow ( $\leq 1$ MHz) spin fluctuations persist into the overdoped regime of Ba(Fe $_{1 - x}$ Rh $_{x}$ ) $_{2}$ As $_{2}$ superconductors. Measurements of the $^{75}$ As spin echo decay rate, obtained both with Hahn Echo and Carr Purcell Meiboom Gill pulse sequences, show that the slowing down of spin fluctuations can be described by short-range diffusive dynamics, likely involving domain walls motions separating $(π / a, 0)$ from $(0, π / a)$ correlated regions. This slowing down of the fluctuations is weakly sensitive to the external magnetic field and, although fading away with doping, it extends deeply into the overdoped regime.

7 pages, 7 figures

References in corpus (10)

Effects of Co substitution on thermodynamic and transport properties and anisotropic $H_{c 2}$ in Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ single crystals
Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2
Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$
Short-range cluster spin glass near optimal superconductivity in BaFe $_{2 - x}$ Ni $_{x}$ As $_{2}$
Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$
Orbital Order and Spin Nematicity in the Tetragonal Phase of Electron-doped Iron-Pnictides NaFe $_{1 - x}$ Co $_{x}$ As
Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2
$^{75}$ As NMR of Ba(Fe $_{0.93}$ Co $_{0.07}$ ) $_{2}$ As $_{2}$ in High Magnetic Field
Structural and antiferromagnetic properties of Ba(Fe $_{1 - x - y}$ Co $_{x}$ Rh $_{y}$ ) $_{2}$ As $_{2}$ compounds

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