D. L. Sun

Normal-state spin dynamics and temperature-dependent spin-resonance energy|[nbsp]|in|[nbsp]|optimally doped BaFe1.85Co0.15As2

A neutron scattering study reveals that the magnetic fluctuations in an iron arsenide superconductor behave according to the conventional theories of metals, unlike the cuprate superconductors. Moreover, the magnetic spin-excitation energies are sufficient to mediate the Cooper pairs that form the superconducting state.

Very strong intrinsic flux pinning and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals

We report that the (Ba,K)Fe2As2 crystal with Tc =3 2 K shows a pinning potential, U0, as high as 104 K, with U0 showing very little field dependence. The (Ba,K)Fe2As2 single crystals become isotropic at low temperatures and high magnetic fields, resulting in a very rigid vortex lattice, even in fields very close to Hc2. The isotropic rigid vortices observed in the two-dimensional (2D) (Ba,K)Fe2As2 distinguish this compound from 2D high-Tc cuprate superconductors with 2D vortices. The vortex avalanches were also observed at low temperatures in the (Ba,K)Fe2As2 crystal. It is proposed that it is the K substitution that induces both almost isotropic superconductivity and the very strong intrinsic pinning in the (Ba,K)Fe2As2 crystal.

Phonon anomalies in pure and underdoped R 1 − x K x Fe 2 As 2 ( R = Ba , Sr) investigated by Raman light scattering

We present a detailed temperature-dependent Raman light scattering study of optical phonons in

Symmetry and disorder of the vitreous vortex lattice in overdoped BaFe2-xCoxAs2: Indication for strong single-vortex pinning

{\text{Ba}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}

Microscopic coexistence of antiferromagnetic order and superconductivity in Ba0.77K0.23Fe2As2

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Nodeless energy gaps of single-crystalline Ba0.68K0.32Fe2As2 as seen via As-75 NMR

x\ensuremath{\sim}0.28

Impurity Effects on Spin Dynamics in Magnetic and Superconducting Iron Pnictides and Chalcogenides

, superconducting

Comparative study of upper critical field Hc2 and second magnetization peak Hsp in hole- and electron-doped BaFe2AS2 superconductor

{T}_{c}\ensuremath{\sim}29\text{ }\text{K}

Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides

),

Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1−xMnx)2As2

{\text{Sr}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}