Vortex images on Ba{1-x}KxFe2As2 observed directly by the magnetic force microscopy
arXiv:1112.2578 · doi:10.1103/PhysRevB.85.014524
Abstract
The vortex states on optimally doped Ba0.6K0.4Fe2As2 and underdoped Ba0.77K0.23Fe2As2 single crystals are imaged by magnetic force microscopy at various magnetic fields below 100 Oe. Local triangular vortex clusters are observed in optimally doped samples. The vortices are more ordered than those in Ba(Fe{1-x}Co{x})2As2, and the calculated pinning force per unit length is about 1 order of magnitude weaker than that in optimally Co-doped 122 at the same magnetic field, indicating that the Co doping at the Fe sites induces stronger pinning. The proportion of six-neighbored vortices to the total amount increases quickly with increasing magnetic field, and the estimated value reaches 100% at several tesla. Vortex chains are also found in some local regions, which enhance the pinning force as well as the critical current density. Lines of vortex chains are observed in underdoped samples, and they may have originated from the strong pinning near the twin boundaries arising from the structural transition.
7 pages, 8 figures
References in corpus (17)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
- Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
- Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
- Reply to Comment on "Unconventional s-wave superconductivity in Fe(Se,Te)"
- Determination of the phase diagram of the electron doped superconductor Ba(FeCo)As
- Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
- Electronic structure of the iron-based superconductor LaOFeP
- Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFeCoAs
- Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
- Observation of Lattice and Andreev Bound States of Vortices in Ba0.6K0.4Fe2As2 Single Crystals with Scanning Tunneling Microscopy/Spectroscopy
- Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4
- Behavior of vortices near twin boundaries in underdoped
- Anisotropic Structure of the Order Parameter in FeSe0.45Te0.55 Revealed by Angle Resolved Specific Heat
- Non-exponential London penetration depth in BaKFeAs single crystals
- Transport properties and asymmetric scattering in BaKFeAs single crystals compared to the electron doped counterparts Ba(FeCo)As}
- Strong pinning and vortex energy distributions in single crystalline Ba(Fe1-xCox)2As2
Cited by in corpus (13)
- Disorder, critical currents, and vortex pinning energies in isovalently substituted BaFe(AsP)
- Observation of a gel of quantum vortices in a superconductor at very low magnetic fields
- Single Vortex Pinning and Penetration Depth in Superconducting NdFeAsOF
- Vortex matter freezing in BiSrCaCuO samples with a very dense distribution of columnar defects
- Diamagnetic Vortex Barrier Stripes in Underdoped
- Dependence of the absolute value of the penetration depth in on doping
- SANS Study of Vortex Lattice Structural Transition in Optimally Doped (BaK)FeAs
- Effects of 6 MeV proton irradiation on the vortex ensemble in BaFe(AsP) revealed through magnetization measurements and real-space vortex imaging
- Vortex lattice and vortex bound states in CsFeAs investigated by scanning tunneling microscopy/spectroscopy
- Non-Gaussian tail in the force distribution: A hallmark of correlated disorder in the host media of elastic objects
- Delocalization of vortex magnetic field near a planar defect
- Superconductivity in Sm-doped 1,3,5-triphenylbenzene
- Vanishing vortex creep at the transition from ordered to disordered vortex phases in BaKFeAs