Article
Dependence of the absolute value of the penetration depth in (Ba1–x Kx) Fe2 As2 on doping
Ames Laboratory Accepted Manuscripts
Publication Date
8-27-2018
Department
Ames Laboratory; Materials Science and Engineering; Physics and Astronomy
OSTI ID+
1471219
Report Number
IS-J 9720
DOI
10.1103/PhysRevB.98.054516
Journal Title
Physical Review B
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.
DOE Contract Number(s)
1897/14; AC02-07CH11358
Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
Disciplines
Citation Information
Avior Almoalem, Alon Yagil, Kyuil Cho, Serafim Teknowijoyo, et al.. "Dependence of the absolute value of the penetration depth in (Ba1–x Kx) Fe2 As2 on doping" Vol. 98 Iss. 5 (2018) p. 054516 Available at: http://works.bepress.com/thomas_lograsso/273/