Dependence of the absolute value of the penetration depth in (Ba1–x Kx) Fe2 As2 on doping
Date
2018-08-27
Authors
Almoalem, Avior
Yagil, Alon
Cho, Kyuil
Teknowijoyo, Serafim
Tanatar, Makariy
Prozorov, Ruslan
Liu, Yong
Lograsso, Thomas
Auslaender, Ophir
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Lograsso, Thomas
Ames Laboratory Division Director
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Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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Materials Science and Engineering
Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.
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Ames National LaboratoryPhysics and AstronomyMaterials Science and Engineering
Abstract
We report magnetic force microscopy (MFM) measurements on the iron-based superconductor Ba1−xKxFe2As2. By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth (λab) in underdoped, optimally doped, and overdoped samples. The results suggest an abrupt increase of λab as doping is increased from xopt, which is potentially related to the presence of a quantum critical point. The response of superconducting vortices to magnetic forces exerted by the MFM tip for x=0.19 and 0.58 is compatible with previously observed structural symmetries at those doping levels.