Publication Date
8-27-2018
Department
Ames Laboratory; Materials Science and Engineering; Physics and Astronomy
Campus Units
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
Volume Number
98
Issue Number
5
First Page
054516
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
Department of Energy Subject Categories
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Publisher
Iowa State University Digital Repository, Ames IA (United States)
